必须现在干（必须要干什么）

大家好，相信到目前为止很多朋友对于必须现在干和必须要干什么不太懂，不知道是什么意思？那么今天就由我来为大家分享必须现在干相关的知识点，文章篇幅可能较长，大家耐心阅读，希望可以帮助到大家，下面一起来看看吧！

1情态动词是干什么用的

情态动词是一种本身有一定的词义,表示说话人的情绪,态度或语气的动词,但不能单独作谓语,

只能和其他动词原形构成谓语。

情态动词在句中放在谓语动词之前,

谓语动词前若有助动词,则在助动词之前,疑问句中,

情态动词则在主语之前。

情态动词无人称和数的变化,

情态动词后面跟的动词需用原形,否定式构成是在情态动词后面加

"not"。

个别情态动词有现在式和过去式两种形式,

过去式用来表达更加客气,

委婉的语气,

时态性不强,

可用于过去，现在或将来。

2如何区分情态动词must should might need

[编辑本段]can和could的用法

1. 表示能力或客观可能性，还可以表示请求和允许。如：

Can you finish this work tonight?

Man cannot live without air.

— Can I go now? — Yes, you can.

注意：①could也可表示请求，语气委婉，主要用于疑问句，不可用于肯定句，答语应用can（即could不能用于现在时态的简略答语中）。如：

Could I come to see you tomorrow?

Yes, you can. （否定答语可用No, I'm afraid not.）

②can表示能力时，还可用be able to代替。如：

I'll not be able to come this afternoon.

2. 表示惊异、怀疑、不相信的态度。（主要用在否定句、疑问句或惊叹句中）

Can this be true?

How can you be so careless!

This cannot be done by him.

3. “can(could) + have + 过去分词”的疑问或否定形式表示对过去发生的行为怀疑或不肯定。如：

He cannot have been to that town.

Can he have got the book?

4. 用在疑问句及否定句中,表示惊讶,不相信等.

5. cannot```too\enough表示"无论怎样``````也不过分","越``````越好"

[编辑本段]may和might的用法

1. 表示许可。

表示请求、允许时，might比may的语气更委婉一些，否定回答时要用mustn't表示“不可以”、“禁止”、“阻止”之意。如：

You may drive the car.

— Might I use your pen? — No, you mustn't.

用May I ... 征询对方许可在文体上比较正式，在口气上比较客气。在日常口语中，用Can I ... 征询对方意见在现代口语中更为常见。

2. 用于祈使句中表示祝愿。如：

May you succeed!

3. 表示推测、可能（疑问句不能用于此意）。

He may be very busy now.

4. “may(might) + have + 过去分词”表示对过去发生的行为的推测。如：

He may not have finished the work.

[编辑本段]must和have to的用法

1. 表示必须、必要。（must表示主观多一些而have to则表示客观多一些）如：

You must come in time.

回答must引出的问句时，如果是否定的回答，不能用mustn't，而要用needn't或don't have to。

— Must we hand in our exercise books today?

— Yes, you must. (No, you don’t have to.)

2. “must be + 表语”的结构表示推测，它的否定或疑问式用can代替must。

This must be your pen.

3. “must + have + 过去分词”的结构常用在肯定句中，表示对过去发生的行为的推测。它的否定或疑问式用can代替must。

He must have been to Shanghai.

4. have to的含义与must相似，两者往往可以互换使用，但have to有各种形式，随have的变化而定。must与have to有下列几点不同：

① must表示的是说话人的主观看法，而have to则往往强调客观需要。如：

The play is not interesting. I really must go now.

I had to work when I was your age.

② must一般只表现在，have则有更多的时态形式。

③ 二者的否定意义不大相同。如：

You mustn't go. 你可不要去。

You don't have to go. 你不必去。

④ 询问对方的意愿时应用must。如：

Must I clean all the room?

[编辑本段]dare和need的用法

1. need表示“需要”或“必须”，作情态动词时，仅用于否定句或疑问句中，在肯定句中一般用must, have to, ought to,或should代替。如：

You needn’t come so early.

— Need I finish the work today?

— Yes, you must.

注意：needn't + 不定式的完成式“表示本来不必做某事而实际上做了某事”。如：

You needn't have waited for me.

2. Dare作情态动词时，主要用于疑问句、否定句和条件从句中，一般不用在肯定句中。如：

How dare you say I'm unfair.

He daren't speak English before such a crowd, dare he?

3. Dare和need常用作实义动词，有时态、人称和数的变化，所不同的是，作实义动词时，在肯定句中，dare后面通常接带to的不定式，在否定和疑问句中，dare后面可接带to或不带to的不定式。如：

I dare to swim across this river.

He does not dare (to) answer.

Don't you dare (to) touch it!

I wondered he dare (to) say that.

He needs to finish it this evening.

[编辑本段]shall和should的用法

1. Shall用于第一人称，表示征求对方的意愿。如：

What shall we do this evening?

2. Shall用于第一、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。如：

Shall we begin our lesson?

When shall he be able to leave the hospital?

3. Shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。如：

You shall fail if you don't work harder. （警告）

He shall have the book when I finish reading. （允诺）

He shall be punished. （威胁）

4. Should表示劝告、建议、命令，其同义词是ought to；在疑问句中，通常用should代替ought to。如：

You should go to class right away.

Should I open the window?

Should的含义较多，用法较活，现介绍三种其特殊用法。请看下面的句子：

① I should think it would be better to try it again. 我倒是认为最好再试一试。

② You are mistaken, I should say. 依我看，你是搞错了。

③ I should advise you not to do that. 我倒是劝你别这样做。

④ This is something I should have liked to ask you. 这是我本来想问你的。

从以上例句可以看出：情态动词should用于第一人称时可以表示说话人的一种谦逊、客气、委婉的语气。

Should还可以用在if引导的条件从句，表示一件事听起来可能性很小，但也不是完全没有可能。相当于“万一”的意思。从句谓语由should加动词原形构成，主句谓语却不一定用虚拟语气。如：

⑤ Ask her to ring me up if you should see her. 你万一见到她，请让她给我打个电话。

⑥ If you should change your mind, please let us know. 万一你改变主意，请通知我们。

⑦ Should I (If I should) be free tomorrow I will come. 万一我明天有时间，我就来。

此外，Why(or How) + should结构表示说话人对某事不能理解，感到意外、惊异等意思。意为“竟会”。如：

⑧ Why should you be so late today? 你几天怎么来得这么晚？

⑨ — Where is Betty living? — 贝蒂住在哪里？

— How should I know? — 我怎么会知道呢？

⑩ I don't know why you should think that I did it. 我真不知道你凭什么认为这件事是我干的。

5. “should + have + 过去分词”结构一般表示义务，表示应该做到而实际上没有做到，并包含一种埋怨、责备的口气。如： She should have finished it.

I should have helped her, but I never could.

You should have started earlier.

[编辑本段]will和would的用法

1. 表示请求、建议等，would比will委婉客气。如：

Would you pass me the book?

2. 表示意志、愿望和决心。如：

I will never do that again.

They asked if we would do that again.

3. 用“will be”和“will(would) + have + 过去分词”的结构表示推测，主要用于第二、三人称。前者表示对目前情况的推测，后者表示对已经完成的动作或事态的推测。如：

This will be the book you want.

He will have arrived by now.

The guests would have arrived by that time.

I thought you would have finished this by now.

4. Would可表示过去反复发生的动作或某中倾向。Would表过去习惯时比used to正式，并没有“现已无此习惯”的含义。如：

The wound would not heal.

During the vacation he would visit me every week.

5. 表料想或猜想。如：

It would be about ten when he left home.

What would she be doing there?

I thought he would have told you all about it.

[编辑本段]ought to的用法

1. Ought to表示应该。如：

You ought to take care of him.

2. 表示推测。注意与must表示推测时的区别：

He must be at home by now. （断定他已到家）

He ought to be home by now. （不十分肯定）

This is where the oil must be. （比较直率）

This is where the oil ought to be. （比较含蓄）

3. “ought to + have + 过去分词”表示过去应做某事而实际未做。如：

You ought to have asked him (but you didn't).

这时，ought to和should可以互相换用。

注意：在美国英语中，ought to用于否定句和疑问句时，to可以省略。如：

Ought you smoke so much?

You oughtn't smoke so much.

[编辑本段]used to，had better，would rather的用法

1. Used to表示过去的习惯动作或状态，现在已不存在，在间接引语中，其形式可不变。如：

He told us he used to play football when he was young.

在疑问句、否定句、否定疑问句或强调句中，可有两种形式：

疑问句

Did you use to go to the same school as your brother?

Used you to go to the same school as your brother?

否定句

I usedn't to go there.

I didn't use to go there.

Usedn't 亦可拼作usen't，但发音皆为[ju:znt]。

否定疑问句

Usen't you to be interested in the theatre?

Didn't you use to be interested in the theatre?

强调句

I certainly used to smoke, but it was a long time ago.

I certainly did use to smoke, but it was a long time ago.

其反意疑问句或简略回答中，也有两种形式：

She used to be very fat, didn't she? （正式）/ use(d)n't she? （口语）

Did you use to play chess? Yes, I did.

Used you to get up early in the morning? Yes, I did. (Yes, I used to.)

2. Had better意为“最好”，后接不带to的不定式。如：

— We had better go now.

— Yes, we had (we'd better / we had better).

Hadn't we better stop now? (Had we better not stop now?)

I think I'd better be going. （用于进行时态，表“最好立即”）

You had better have done that. （用于完成时态，表未完成动作）

注：①had best与had better同意，但较少用。②You had better … 用于同辈或小辈，对长辈不可用。

3. Would rather意为“宁愿”，表选择，后接不带to的不定式。如：

I'd rather not say anything.

Would you rather work on a farm?

— Wouldn't you rather stay here?

— No, I would not. I'd rather go there.

由于would rather表选择，因而后可接than。如：

I would rather work on a farm than in a factory.

I would rather watch TV than go to see the film.

I would rather lose a dozen cherry trees than that you should tell me one lie.

I'd rather you didn't talk about this to anyone. （句中的'd rather不是情态动词，would在此是表愿望的实义动词）

[编辑本段]can (could), may (might), 用法:

can (could) 表示说话人能,可以,同意,准许,以及客观条件许可,could 为 can 的过去式。

Can you pass me the books?

你能给我递一下书吗 ?

Could you help me, please?

请问,你能帮助我吗?

What can you do?

你能干点什么呢?

Can you be sure?

你有把握吗?

can 和could 只能用于现在式和过去式两种时态,将来时态用 be able to 来表示。

He could help us at all.

他完全可以帮助我们。

With the teacher's help,I shall be able to speak English correctly.

由于老师的帮助,我将能准确地讲英语。

may (might) 可以, 表示说话人同意,许可或请求对方许可。

You may take the book home.

你可以把书带回家去.

May I come in?

我可以进来吗?

May I use your dictionary?

我可以用你的词典吗?

You may put on more clothes.

你可以多穿点衣服.

He said he might lend us some money.

他说他可以借给我们一些钱。

may 否定式为 may not, 缩写形式是 mayn't.

might 是may 的过去式, 有两种用法, 一种表示过去式，一种表示虚拟语气, 使语气更加委婉, 客气或对可能性的怀疑。

He told me he might be here on time.

他说他能按时间来。

Might I borrow some money now.

我可以借点钱吗?

He might be alive.

他可能还活着。

[编辑本段]must, need, ought to, dare (dared)用法

Must 必须,应该,一定,准是, 表示说话人认为有必要做某事, 命令, 要求别人做某事以及对事物的推测。

must 用来指一般现在时和一般将来时, 过去式可用 have to 的过去式代替。

I must finish my work today. 我今天必须完成我的工作。

You mustn't work all the time. 你不能老是工作。

Must I return the book tomorrow? 我必须明天还书吗?

After such a long walk, you must be tired. 走了这么长的路,你一定困了。

He must be the man I am looking for. 他一定是我要找的人。

He had to go because of somebody's calling him that day. 那天他要走是因为有人叫他。

must + have + 过去分词,表示现在对过去事物的推测。

He must have told my parents about it.

他一定把这件事情告诉我父母亲了。

He must have received my letter now.

他现在一定收到我的信了。

It's six o'clock already, we must have been late again.

已经六点钟了，我们一定又迟到了。

must 和 have to 的区别: must 表示说话人的主观思想, have to 表示客观需要。

You must do it now.

你必需现在就干。(说话人认为必须现在干)

I have to go now.

我得走了。(客观条件必须现在走)

need 需要 多用在否定式或疑问句中.

Need I attend the meeting tomorrow?

我需要明天参加会议吗?

You need not hand in the paper this week.

这一周你不必交论文。

need 是一个情态动词, 他的用法完全和其他情态动词一样, 但 need 还可当作实义动词使用, 这时 need 就象其他动词一样,有第三人称,单复数, 后面加带 to 的动词等特性。

I need a bike to go to school.

我上学需要一辆自行车。

Do you need a dictionary?

你需要词典吗?

She needs a necklace.

她需要一条项链。

needn't + have + 过去分词 表示过去做了没必要做的事情。

You needn't have taken it seriously.

这件事情你不必太认真。

dare 敢 多用在否定或疑问句中。

The little girl dare not speak in public.

小女孩不敢在公众面前说话。

Dare you catch the little cat?

你敢抓小猫吗?

dare 除用作情态动词外,更多的是当实义动词使用, 用法同实义动词一样,要考虑人称,单复数,时态等。

Do you dare to walk in the dark?

你敢黑夜走路吗？

He doesn't dare to tell the teacher what happened that day.

他不敢告诉老师那天发生的事。

[编辑本段]ought，will ，Shall, should，have to

ought 应当,应该 后面跟带有 to 的动词不定式。

You ought to read these books if you want to know how to repair the motorcar.

如果你想知道如何修理汽车,你应该读这些书。

You ought to bring the child here.

你应该把孩子带来。

ought + to have done 句型。指过去动作,表示一件事情该做而未做。

You ought to have been here yesterday.

你昨天就应该来。

ought not to have done 句型。表示一件不该做的事情却做了。

You ought not to have taken the book out of the reading-room.

你不应该把书带出阅览室。

will (would)决心,愿望。 would 为 will 的过去式,

可用于各人称。

I'll do my best to catch up with them.

我要尽全力赶上他们。

I'll never do it again, that's the last time.

我再不会做那件事情了,这是最后一次。

He said he would help me.

他说他会帮助我。

will, would用于疑问句表示说话人向对方提出请求或询问,用 would 比 will 更婉转,客气。

It's hot. Will you open the windows?

天气太热了,你能打开窗户吗?

Will you help me to work it out?

你能帮我解这道题吗?

Would you like some coffee？

给你来点咖啡怎样？

Shall, should表示命令,警告,允诺,征求,劝告,建议惊奇。

You should hand in the exercise book.

你应该交作业本儿了。

This should be no problem.

这应该没问题。

Shall we go now.

我们现在可以走了吗?

Why should I meet him？

为什么我要见他?

have to,不得不,必须,表示客观条件只能如此, 而must 则表示主观思想必须。

I have to go now.

我现在得走了。

I have to cook for my child.

我得给孩子做饭。

You must be here on time next time.

你下次一定要按时来。

We must go to get the timetable ourselves.

我们一定要自己去拿时刻表。

我把所有的都给你了，希望能对你有帮助

3情态动词

在英语中主要的情态动词有can (could), may (might), must, have to, need , ought to, dare (dared), shall (should), will (would) 。

情态动词的特征：

（1）情态动词本身有词义，但词义不完成，因此不能单独作谓语，只能和其他的动词原形一起构成谓语。

（2）情态动词后接的动词不定式一律不带to。

（3）情态支词不随人称变化而变（即不管是何人称，后面接的情态动词都一样）。

（4）含有情态动词的否定都是由“情态动词+not”构成的，如：can-can not   may-may not need-need not

(5)含有情态动词的疑问句的构成

May I come in?我可以进来吗？

Can you lend me some money?你能借给我一些钱吗？

注意：含有have to 的句子变成疑问句时不同。如：

I have to go today,今天我必须走，

Do you have to go today?你今天必须走吗？

扩展资料

1、情态动词具有助动词作用，可以用来构成否定句，疑问句及用于简单回答。

Can you sing English songs？ 你会唱英语歌吗？

Yes ,I can. 是的，我会。

2、后接动词原形，接不带to的不定式。

She may lose her way. 她可能迷路了。

3、无人称和数的变化。

We must stay here. 我们必须待在这儿。

He must stay here. 他必须待在这儿。

4、有一定的词义，但并不完整，必须与动词原形一起构成谓语。（后面加动词原形）

5、在以Could引导的表示委婉语气的疑问句，常用来表示请求别人帮助或对长辈的请求的。

如：（Could you come to my party on Saturday afternoon?）注意：这里不是情态动词的用法。回答为：肯定：Yes，I can./Sure./Certainly. 否定:Sorry,I am afraid not.

(在作否定回答时，要注意：在拒绝长辈的请求时，不能用can not，这样显得语气太过生硬，不礼貌。但是在长辈拒绝晚辈的请求是可以用can not的。)

4need和must的用法 （详细）（初中）

must

必须,应该,一定,准是,

表示说话人认为有必要做某事,

命令,

要求别人做某事以及对事物的推测。

must

用来指一般现在时和一般将来时,

过去式可用

have

to

的过去式代替。

i

must

finish

my

work

today.

我今天必须完成我的工作。

you

mustn't

work

all

the

time.

你不能老是工作。

must

i

return

the

book

tomorrow?

我必须明天还书吗?

after

such

a

long

walk,

you

must

be

tired.

走了这么长的路,你一定困了。

he

must

be

the

man

i

am

looking

for.

他一定是我要找的人。

he

had

to

go

because

of

somebody's

calling

him

that

day.

那天他要走是因为有人叫他。

must

+

have

+

过去分词,表示现在对过去事物的推测。

he

must

have

told

my

parents

about

it.

他一定把这件事情告诉我父母亲了。

he

must

have

received

my

letter

now.

他现在一定收到我的信了。

it's

six

o'clock

already,

we

must

have

been

late

again.

已经六点钟了，我们一定又迟到了。

must

和

have

to

的区别:

must

表示说话人的主观思想,

have

to

表示客观需要。

you

must

do

it

now.

你必需现在就干。(说话人认为必须现在干)

i

have

to

go

now.

我得走了。(客观条件必须现在走)

need

需要

多用在否定式或疑问句中.

need

i

attend

the

meeting

tomorrow?

我需要明天参加会议吗?

you

need

not

hand

in

the

paper

this

week.

这一周你不必交论文。

need

是一个情态动词,

他的用法完全和其他情态动词一样,

但

need

还可当作实义动词使用,

这时

need

就象其他动词一样,有第三人称,单复数,

后面加带

to

的动词等特性。

i

need

a

bike

to

go

to

school.

我上学需要一辆自行车。

do

you

need

a

dictionary?

你需要词典吗?

she

needs

a

necklace.

她需要一条项链。

needn't

+

have

+

过去分词

表示过去做了没必要做的事情。

you

needn't

have

taken

it

seriously.

这件事情你不必太认真。

5帮我写一些初中的情态动词

情态动词的定义和特点：

1. 情态动词表示说话人的态度和看法，认为可能、应该或必要等，情态动词本身有意义：

e.g. You may have read some account of the matter. （或许）

We can be there on time tomorrow. 我们明天能按时去那儿。(能力)

May I have your name? 我能知道你的名字吗？ （容许）

Shall we begin now? 我们现在就开始吗？

You must obey the school rules. 你必须遵守校规。

2. 情态动词后面加动词原形：

e.g. Still, she needn't run away. （他完全没有必要走。）

3. 情态动词无第三人称和单复数的变化。

e.g. She dare not say what she thinks.

4. 情态动词是不及物动词，无被动语态。

5. 过去式用来表达更加客气、委婉的语气。

e.g. Would you mind very much if I ask you to do something?

你介意不介意我请你做些事情？

6. 时态性不强。

e.g. She told him he ought not to have done it.

她（当时）告诉他，他不应该做了那些事情。

7. 倒装：

　e.g. Nowhere can he obtain any information about his sister.

8. 省略和替代动词：

e.g. A: Who can solve this crossword puzzle?

B: Tom can.

　 　 A: Shall I write to him?

B: Yes, do.

III. Function and Usage功能与运用:

1. ability能够(做或达到)： “can / could / be able to”

1) “can, could” (人或物做主语) ---- (of a person or thing) general ability

e.g. The hall can seat 1,000 people. 这个大厅能坐1 000人。

He can drive a bus. / What can I do for you?

Can you play the piano?

He could play football well when he was 10.

We can't carry the heavy box.

I'm sorry I can't help you.

2) ‘be able to do’（人做主语）– instant ability 具体的、一次性的能力

e.g. I was not tired and able to swim across the river. (instant ability)

I'll not be able to come this afternoon.

2. possibility 能够：（客观可能性）: “may / might / can”

1) “can” expresses “theoretical possibility逻辑上的可能性”；

e.g. He is in poor health. He can be ill at any time.

　Can you finish this work tonight?

Man can not live without air.

2) “may” – “possibility” occurs only in statements 不在否定句中用P283

e.g. It may be true. 那可能是真的。

The road may be blocked. 这条路可能不通了。

He looks pale. He may be ill.

He said he might be late. 他说他可能会迟到。

“may” 比 “might” 的可能性要大。

Note When “may” is used in a question or negative sentence, it has a different meaning.

e.g. “You may not take it.” – “你不可以拿走。”

“May I take it home？ – “我可不可以把它拿回家？”

3) “might” conveys greater uncertainty in tone than “may” 更加不肯定的语气

e.g. It might rain, and again it might not. 天可能下雨，也可能不下雨。

The soft music might calm your jutters.

柔和的音乐或许能使你紧张的情绪安定下来。

** may (just) as well / might (just) as well: “不妨做”, “还是…为好”, might 比may 语气更委婉，根据情形选择。

e.g. Catherine, you may as well come too. 凯瑟琳，你不妨也去。

If that’s the case, I may as well try. 如果情况如此，我不妨试一试。

You might just as well tell me the truth. 你还是对我们说实话的好。

We might just as well get round the table. 我们不防围着桌子坐下。

3. permission 表示请求和允许：“can / could / may / might / must”

1) can / could

e.g. -- Can I go now? -- Yes, you can.

Can you pass me the books? 　你能给我递一下书吗 ?

Could you help me, please? 　请问,你能帮助我吗?

“-- Could I come to see you tomorrow?

-- Yes, you can.” （否定答语可用No, I'm afraid not.）

could语气委婉，主要用于疑问句，答语应用can.

2) may / might

might比may的语气更委婉，否定回答时(口语中常用) no , you can't. or, yes, please

　e.g. “-- May I use your dictionary? -- Yes, please.”

“-- Might I use your pen? -- No, you can't. ”

You may drive the car.

You may take the book home.

“-- May I come in? 　 -- Yes, please.”

“---Where can he be?” “—He may / might be in the office.”

(用May I ... 比较正式、客气。在口语中，常用Can I ... 征询对方意见。)

3) mustn't表示“不可以”、“禁止”、“阻止”之意(具有强烈禁止的意思)如：

e.g.“May I take this magazine out?” “No, you mustn't.”

“我可以把这本杂志借走吗?”“不, 不行。

4. obligation义务性的必须: “must / have to / ought to / should”

e.g. The children must be back by 4 o'clock.

You must remember to write home.

We mustn't waste our time.

You ought to have asked him (but you didn't).

这时，ought to和should可以互相换用。

Ought you smoke so much?

You oughtn't smoke so much.

1）must最强，ought语气略强、正式，should较常用。

2）must 表示说话人的主观思想, have to 表示客观需要。

You must do it now. 你必需现在就干。(说话人认为必须现在干)

You must come in time.

I have to go now. 　我得走了。(不想走，但客观条件必须走。)

3）回答must引出的问句时，如果是否定的回答，不能用mustn't，而要用needn't或don't have to。

　e.g. — Must we hand in our exercise books today?

— Yes, you must. (No, you don’t have to.)

4）在疑问句中，通常用should

　e.g. Should I open the window?

5) 表示应该做到而实际上没有做到，并包含一种埋怨、责备的口气。

e.g. She should have finished it.

He should have helped her, but he never could.

You should have started earlier.

Why must you always bother me?

5. special feelings表示惊异、怀疑、不快、失望等态度和感情：“should / can / could”

(to denote emotional feeling of displeasure, surprise, wonder, disappointment, etc.)

e.g. It’s a pity (that) they should lose the game so soon. (disappointment)

How should he speak such rude words to his mother? (surprise)

It is unbelievable that he should be working so hard.

How could I know? 我怎么会知道呢？

Why should you be so late today? 你几天怎么来得这么晚？

— Where is Betty living? — 贝蒂住在哪里？

— How should I know? — 我怎么会知道呢？

I don't know why you should think that I did it.

我真不知道你凭什么认为这件事是我干的。

6. prediction 预见: “will”:

　e.g. This will be the book you want.

He will have arrived by now.

He will be a different person when he lives in England.

7. intention / resolution / will / warning: 说话人的意愿 / 意图 / 决心 / 警告:

“shall, will”

(Note: used for the 2nd and 3rd persons包括用于第二和第三人称作主语)

e.g. You shall stay with us as long as you like.

= I’m willing to let you stay with us as long as you like.

He shall be praised if he works hard this term.

= I’ll see that he is praised if he works hard this term.

I will never do that again.

They shall not pass. == We won’t let them pass. （warning）

You shall fail if you don't work harder.

He shall be punished.

He shan’t come here == I won’t let him come here.

You shall obey my orders. == I insist that you obey my order.

He shall leave the country at once. == I insist that he leave the country at once.

8. ask for advice征求意见： “shall”

　e.g. What shall we do this evening?

Shall we begin our lesson?

Let’s go together, shall we?

9. politeness / euphemism / modesty: 礼貌 / 委婉 / 谦虚: “should, would”

e.g. Would you pass me the book?

Would you kindly show me the way to the station? 你可以指点我去车站的路吗?

If you would kindly wait here a minute, I’ll ring the director’s office.

I should think it would be better to try it again. 我倒是认为最好再试一试。

　 You are mistaken, I should say. 依我看，你是搞错了。 　

　 I should advise you not to do that. 我倒是劝你别这样做。

　 This is something I should have liked to ask you. 这是我本来想问你的。

10. repeated action 重复的动作：“will, would”

e.g. He would sit for hours doing nothing. 过去他常常坐几个钟头什么事也不做。

He would come to see us on Sundays. 过去星期天他经常来看望我们。

She will dance for hours. 她经常跳舞跳上几个小时。

He will keep intruding. 他老是打扰别人。

11. guessing 推测、猜测：“must, should, may / might, can / could, would, ought to”

　e.g. He may be very busy now.

　 This must be your pen. / This can’t be your pen.

It would be about ten when he left home.

What would she be doing there?

I thought he would have told you all about it.

After such a long walk, you must be tired. 走了这么长的路,你一定困了。

He must be the man I am looking for. 他一定是我要找的人。

（A）情态动词表推测常用的三种句式：

1）在肯定句中一般用must (一定)，may（可能），might / could（也许，或许）。

以上情态动词的语气按程度是依次递减的。注意：might, could并非may, can的过去式，而表示语气较为委婉或可能性较小。

　 e.g. He must / may / might know the answer to this question?

他一定 / 可能 / 也许知道这个问题的答案。

It is cold in the room. They must have turned off the heating.

屋里很冷，他们肯定把暖气关了。

2）否定句中用can’t / couldn’t (不可能), may not/might not (也许不会)。

　 e.g. It can’t / couldn’t be the headmaster. He has gone to America.

这不可能是校长，他去美国了。

He may not / might not know the scientist. 他也许不认识那位科学家。

3）疑问句中用can/could (能……?)。

　 e.g. Could he have finished the task? 他可能把任务完成了吗？

Can he be at home now? 他现在能在家吗？

（B）情态动词表推测常用的三种时态： 　

1）对将来情况的推测，用“情态动词 + 动词原形”。

　 e.g. She must / may / might / could arrive before 5. 　5:00前她一定/可能/也许到。

She must/may/might/could walk miles and miles among the hills without meeting anyone.

她一定/可能/也许会在山里一连走好几英里而遇不到一个人。

2）对现在或一般情况的推测，用“情态动词 + be”，“情态动词 +be doing”或“情态动词 + 动词原形”。

　e.g. He must / may / might / could be listening to the radio now.

他一定/可能/也许正在听收音机。

　 He can’t ( couldn’t ) / may ( might ) not be at home at this time.

这个时候他不可能/可能不在家。

How can (could) he be late for the opening ceremony ?

布什先生一向准时，这次开幕式他怎么可能迟到呢？

It’s seven o’clock. Jack should/ought to be here at any moment.

现在七点钟了，杰克理应随时到达。（推测）

3）对过去情况的推测用“情态动词 + have +过去分词”。

e.g. It must / may / might / could have rained last night. The ground is wet.

地湿了，昨晚肯定/可能/也许下雨了。

The door was locked. He can (could ) not / may ( might ) not have been at home.

门锁着，他不可能/可能不在家。

Can / Could he have gotten the book？ 难道他找到书了吗？

Note: 虚拟语气:

e.g. They would be killed if the car went over the cliff.

如果汽车翻在悬崖下, 他们就会丧命。

They would have been killed if the car had gone over the cliff.

如果汽车当时翻到悬崖下, 他们早就丧命了。

She should / ought to have attended your birthday party, but she had to look after her mother in hospital.

她本该出席你的生日晚会的，可是她得在医院照顾她妈妈。

Tom should not /ought not to have told me your secret, but he meant no harm.

汤姆本不该告诉我你的秘密，可是他并无恶意。

He may not have finished the work.

(虚拟语气部分 Subjunctive Mood：See Chapter 16, 34)

12. dare和need的两重性: 情态动词和实义动词

1) need表示“需要”或“必须”，作情态动词时，仅用于否定句或疑问句中，在肯定句中一般用must, have to, ought to,或should代替。如：

　e.g. You needn’t come so early.

“— Need I finish the work today?

— Yes, you must.”

“needn't + 完成式” 表示本来不必做某事而实际上做了某事:

You needn't have waited for me for long. 没有必要等了我这么久。

“-- Need I attend the meeting?

-- No, you need not have arrived so earlier.”

2) dare作情态动词时，主要用于疑问句、否定句和条件从句中，一般不用在肯定句中。

　e.g. How dare you say I'm unfair!

He daren't speak English before such a crowd, dare he?

The little girl dare not speak in public. 小女孩不敢在公众面前说话。

Dare you catch the little cat? 你敢抓小猫吗?

3) dare和need也作实义动词，有时态、人称和数的变化。

肯定句：dare + to do

e.g. He needs to finish it this evening.

I dare to swim across this river.

否定句: do not dare (to) do

e.g. Tom didn't dare to do it. 汤姆不敢做那件事。

He does not dare (to) answer.

　 　Don't you dare (to) touch it!

He doesn't dare to tell the teacher what happened that day.

疑问句：Does Do … dare (to) do….? 疑问句中可省略 to

e.g. Does she dare (to) go alone? 她敢一个人去吗?

　Do you dare to walk in the dark? 你敢黑夜走路吗？

6关于英语的情态动词的用法(急！！！越快越好，尽量在两天内回答。好的再加分)

定义:

情态动词是一种本身有一定的词义,但要与不带to的普通动词的不定式一起使用，给谓语动词增添情态色彩，表示说话人对有关行为或事物的态度和看法，认为其可能、应该或必要等。

情态动词后面加动词原形。

[编辑本段]分类：

情态动词有四类：

①只做情态动词：must,can(could),may(might),ought to

②可做情态动词又可做实义动词：need,dare

③可做情态动词又可做助动词：shall(should),will(would)

④具有情态动词特征：have(had) to,used to

[编辑本段]位置:

情态动词在句中放在谓语动词之前, 谓语动词前若有助动词,则在助动词之前,疑问句中, 情态动词则在主语之前。

I can see you. Come here.

我能看见你，过来吧。

He must have been away.

他一定走了。

What can I do for you?

我能帮你吗？

How dare you treat us like that！

你怎能那样对待我们！

[编辑本段]特点:

情态动词无人称和数的变化, 情态动词后面跟的动词需用原形,否定式构成是在情态动词后面加 "not"。 个别情态动词有现在式和过去式两种形式, 过去式用来表达更加客气, 委婉的语气, 时态性不强, 可用于过去，现在或将来。情态动词属非及物动词，故没有被动语态。

He could be here soon.

他很快就来。

We can't carry the heavy box.

我们搬不动那箱子。

I'm sorry I can't help you.

对不起，我帮不上你。

基本助动词与情态助动词最主要的区别之一是，基本助动词本身没有词义，而情态助动词则有自己的词义，能表示说话人对有关动作或状态的看法，或表示主观设想：

What have you been doing since? （构成完成进行体，本身无词义）

I am afraid I must be going. （一定要）

You may have read some account of the matter. （或许已经）

除此之外，情态助动词还有如下词法和句法特征：

1） 除ought和used以外，其他情态动词后面只能接不带to的不定式。如果我们把ought to和used to看做是固定词组的话，那么，所有情态动词无一例外地只能接不带to的不定式：

We used to grow beautiful roses.

I asked if he would come and repair my television set.

2） 情态助动词在限定动词词组总是位居第一：

They need not have been punished so severely.

3） 情态助动词用于第三人称单数现在时的时候，没有词形变化，即其词尾无-s形式：

She dare not say what she thinks.

4） 情态动词没有非限定形式，即没有不定式和分词形式，也没有相应的动名词：

Still, she needn't have run away.

5） 情态助动词的“时”的形式并不是时间区别的主要标志。在不少场合，情态助动词的现在时和过去时形式都可以表示现在、过去或将来时间：

Would you mind very much if I ask you to do something?

She told him he ought not to have done it.

6） 情态助动词之间是相互排斥的，即在一个限定动词词组中只能出现一个情态助动词，但有时却可以与have和be基本助动词连用：

You should have washed the wound.

Well, you shouldn't be reading a novel.

[编辑本段]用法

首先它是动词，而且不同于行为动词，行为动词表示的是可以通过行为来表达的动作（如写，读，跑），而情态动词只是表达的一种想法（如能，也许，敢）。

用法是：情态动词+行为动词原形

例句：I can read this sentence in English.

我能用英语读这句话。

情态动词是一种本身有一定的词义,表示说话人的情绪,态度或语气的动词,但不能单独作谓语, 只能和其他动词原形构成谓语。

We can be there on time tomorrow.我们明天能按时去那儿。

May I have your name? 我能知道你的名字吗？

Shall we begin now?我们现在就开始吗？

You must obey the school rules.你必须遵守校规。

情态动词数量不多,但用途广泛,主要有下列:

can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would),have (to) ,had better.

[编辑本段]功能

助动词(auxiliary)主要有两类：基本助动词(primary auxiliary)和情态助动词(modal auxiliary)。基本助动词有三个：do, have和be；情态助动词有十三个：may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to. 上述两类助动词的共同特征是，在协助主动词构成限定动词词组时，具有作用词的功能：

1） 构成否定式：

He didn't go and neither did she.

The meeting might not start until 5 o'clock.

2） 构成疑问式或附加疑问式：

Must you leave right now?

You have been learning French for 5 years, haven't you?

3） 构成修辞倒装：

Nowhere can he obtain any information about his sister.

Hardly had he arrived when she started complaining.

4） 代替限定动词词组：

A: Who can solve this crossword puzzle?

B: Tom can.

A: Shall I write to him?

B: Yes, do.

[编辑本段]can和could的用法

1. 表示能力或客观可能性，还可以表示请求和允许。如：

Can you finish this work tonight?

Man cannot live without air.

— Can I go now? — Yes, you can.

注意：①could也可表示请求，语气委婉，主要用于疑问句，不可用于肯定句，答语应用can（即could不能用于现在时态的简略答语中）。如：

Could I come to see you tomorrow?

Yes, you can. （否定答语可用No, I'm afraid not.）

②can表示能力时，还可用be able to代替。如：

I'll not be able to come this afternoon.

2. 表示惊异、怀疑、不相信的态度。（主要用在否定句、疑问句或惊叹句中）

Can this be true?

How can you be so careless!

This cannot be done by him.

3. “can(could) + have + 过去分词”的疑问或否定形式表示对过去发生的行为怀疑或不肯定。如：

He cannot have been to that town.

Can he have got the book?

4. 用在疑问句及否定句中,表示惊讶,不相信等.

5. cannot```too\enough表示"无论怎样``````也不过分","越``````越好"

[编辑本段]may和might的用法

1. 表示许可。

表示请求、允许时，might比may的语气更委婉一些，否定回答时要用mustn't表示“不可以”、“禁止”、“阻止”之意。如：

You may drive the car.

— Might I use your pen? — No, you mustn't.

用May I ... 征询对方许可在文体上比较正式，在口气上比较客气。在日常口语中，用Can I ... 征询对方意见在现代口语中更为常见。

2. 用于祈使句中表示祝愿。如：

May you succeed!

3. 表示推测、可能（疑问句不能用于此意）。

He may be very busy now.

4. “may(might) + have + 过去分词”表示对过去发生的行为的推测。如：

He may not have finished the work.

[编辑本段]must和have to的用法

1. 表示必须、必要。（must表示主观多一些而have to则表示客观多一些）如：

You must come in time.

回答must引出的问句时，如果是否定的回答，不能用mustn't，而要用needn't或don't have to。

— Must we hand in our exercise books today?

— Yes, you must. (No, you don’t have to.)

2. “must be + 表语”的结构表示推测，它的否定或疑问式用can代替must。

This must be your pen.

3. “must + have + 过去分词”的结构常用在肯定句中，表示对过去发生的行为的推测。它的否定或疑问式用can代替must。

He must have been to Shanghai.

4. have to的含义与must相似，两者往往可以互换使用，但have to有各种形式，随have的变化而定。must与have to有下列几点不同：

① must表示的是说话人的主观看法，而have to则往往强调客观需要。如：

The play is not interesting. I really must go now.

I had to work when I was your age.

② must一般只表现在，have则有更多的时态形式。

③ 二者的否定意义不大相同。如：

You mustn't go. 你可不要去。

You don't have to go. 你不必去。

④ 询问对方的意愿时应用must。如：

Must I clean all the room?

[编辑本段]dare和need的用法

1. need表示“需要”或“必须”，作情态动词时，仅用于否定句或疑问句中，在肯定句中一般用must, have to, ought to,或should代替。如：

You needn’t come so early.

— Need I finish the work today?

— Yes, you must.

注意：needn't + 不定式的完成式“表示本来不必做某事而实际上做了某事”。如：

You needn't have waited for me.

2. Dare作情态动词时，主要用于疑问句、否定句和条件从句中，一般不用在肯定句中。如：

How dare you say I'm unfair.

He daren't speak English before such a crowd, dare he?

3. Dare和need常用作实义动词，有时态、人称和数的变化，所不同的是，作实义动词时，在肯定句中，dare后面通常接带to的不定式，在否定和疑问句中，dare后面可接带to或不带to的不定式。如：

I dare to swim across this river.

He does not dare (to) answer.

Don't you dare (to) touch it!

I wondered he dare (to) say that.

He needs to finish it this evening.

[编辑本段]shall和should的用法

1. Shall用于第一人称，表示征求对方的意愿。如：

What shall we do this evening?

2. Shall用于第一、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。如：

Shall we begin our lesson?

When shall he be able to leave the hospital?

3. Shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。如：

You shall fail if you don't work harder. （警告）

He shall have the book when I finish reading. （允诺）

He shall be punished. （威胁）

4. Should表示劝告、建议、命令，其同义词是ought to；在疑问句中，通常用should代替ought to。如：

You should go to class right away.

Should I open the window?

Should的含义较多，用法较活，现介绍三种其特殊用法。请看下面的句子：

① I should think it would be better to try it again. 我倒是认为最好再试一试。

② You are mistaken, I should say. 依我看，你是搞错了。

③ I should advise you not to do that. 我倒是劝你别这样做。

④ This is something I should have liked to ask you. 这是我本来想问你的。

从以上例句可以看出：情态动词should用于第一人称时可以表示说话人的一种谦逊、客气、委婉的语气。

Should还可以用在if引导的条件从句，表示一件事听起来可能性很小，但也不是完全没有可能。相当于“万一”的意思。从句谓语由should加动词原形构成，主句谓语却不一定用虚拟语气。如：

⑤ Ask her to ring me up if you should see her. 你万一见到她，请让她给我打个电话。

⑥ If you should change your mind, please let us know. 万一你改变主意，请通知我们。

⑦ Should I (If I should) be free tomorrow I will come. 万一我明天有时间，我就来。

此外，Why(or How) + should结构表示说话人对某事不能理解，感到意外、惊异等意思。意为“竟会”。如：

⑧ Why should you be so late today? 你几天怎么来得这么晚？

⑨ — Where is Betty living? — 贝蒂住在哪里？

— How should I know? — 我怎么会知道呢？

⑩ I don't know why you should think that I did it. 我真不知道你凭什么认为这件事是我干的。

5. “should + have + 过去分词”结构一般表示义务，表示应该做到而实际上没有做到，并包含一种埋怨、责备的口气。如： She should have finished it.

I should have helped her, but I never could.

You should have started earlier.

[编辑本段]will和would的用法

1. 表示请求、建议等，would比will委婉客气。如：

Would you pass me the book?

2. 表示意志、愿望和决心。如：

I will never do that again.

They asked if we would do that again.

The door won't open

3. 用“will be”和“will(would) + have + 过去分词”的结构表示推测，主要用于第二、三人称。前者表示对目前情况的推测，后者表示对已经完成的动作或事态的推测。如：

This will be the book you want.

He will have arrived by now.

The guests would have arrived by that time.

I thought you would have finished this by now.

4. Would可表示过去反复发生的动作或某种倾向。Would表过去习惯时比used to正式，并没有“现已无此习惯”的含义。如：

The wound would not heal.

During the vacation he would visit me every week.

5. 表料想或猜想。如：

It would be about ten when he left home.

What would she be doing there?

I thought he would have told you all about it.

[编辑本段]ought to的用法

1. Ought to表示应该。如：

You ought to take care of him.

2. 表示推测。注意与must表示推测时的区别：

He must be at home by now. （断定他已到家）

He ought to be home by now. （不十分肯定）

This is where the oil must be. （比较直率）

This is where the oil ought to be. （比较含蓄）

3. “ought to + have + 过去分词”表示过去应做某事而实际未做。如：

You ought to have asked him (but you didn't).

这时，ought to和should可以互相换用。

注意：在美国英语中，ought to用于否定句和疑问句时，to可以省略。如：

Ought you smoke so much?

You oughtn't smoke so much.

[编辑本段]used to，had better，would rather的用法

1. Used to表示过去的习惯动作或状态，现在已不存在，在间接引语中，其形式可不变。如：

He told us he used to play football when he was young.

在疑问句、否定句、否定疑问句或强调句中，可有两种形式：

疑问句

Did you use to go to the same school as your brother?

Used you to go to the same school as your brother?

否定句

I usedn't to go there.

I didn't use to go there.

Usedn't 亦可拼作usen't，但发音皆为[ju:znt]。

否定疑问句

Usen't you to be interested in the theatre?

Didn't you use to be interested in the theatre?

强调句

I certainly used to smoke, but it was a long time ago.

I certainly did use to smoke, but it was a long time ago.

其反意疑问句或简略回答中，也有两种形式：

She used to be very fat, didn't she? （正式）/ use(d)n't she? （口语）

Did you use to play chess? Yes, I did.

Used you to get up early in the morning? Yes, I did. (Yes, I used to.)

2. Had better意为“最好”，后接不带to的不定式。如：

— We had better go now.

— Yes, we had (we'd better / we had better).

Hadn't we better stop now? (Had we better not stop now?)

I think I'd better be going. （用于进行时态，表“最好立即”）

You had better have done that. （用于完成时态，表未完成动作）

注：①had best与had better同意，但较少用。②You had better … 用于同辈或小辈，对长辈不可用。

3. Would rather意为“宁愿”，表选择，后接不带to的不定式。如：

I'd rather not say anything.

Would you rather work on a farm?

— Wouldn't you rather stay here?

— No, I would not. I'd rather go there.

由于would rather表选择，因而后可接than。如：

I would rather work on a farm than in a factory.

I would rather watch TV than go to see the film.

I would rather lose a dozen cherry trees than that you should tell me one lie.

I'd rather you didn't talk about this to anyone. （句中的'd rather不是情态动词，would在此是表愿望的实义动词）

[编辑本段]can (could), may (might), 用法:

can (could) 表示说话人能,可以,同意,准许,以及客观条件许可,could 为 can 的过去式。

Can you pass me the books?

你能给我递一下书吗 ?

Could you help me, please?

请问,你能帮助我吗?

What can you do?

你能干点什么呢?

Can you be sure?

你有把握吗?

can 和could 只能用于现在式和过去式两种时态,将来时态用 be able to 来表示。

He could help us at all.

他完全可以帮助我们。

With the teacher's help,I shall be able to speak English correctly.

由于老师的帮助,我将能准确地讲英语。

may (might) 可以, 表示说话人同意,许可或请求对方许可。

You may take the book home.

你可以把书带回家去.

May I come in?

我可以进来吗?

May I use your dictionary?

我可以用你的词典吗?

You may put on more clothes.

你可以多穿点衣服.

He said he might lend us some money.

他说他可以借给我们一些钱。

may 否定式为 may not, 缩写形式是 mayn't.

might 是may 的过去式, 有两种用法, 一种表示过去式，一种表示虚拟语气, 使语气更加委婉, 客气或对可能性的怀疑。

He told me he might be here on time.

他说他能按时间来。

Might I borrow some money now.

我可以借点钱吗?

He might be alive.

他可能还活着。

[编辑本段]must, need, ought to, dare (dared)用法

Must 必须,应该,一定,准是, 表示说话人认为有必要做某事, 命令, 要求别人做某事以及对事物的推测。

must 用来指一般现在时和一般将来时, 过去式可用 have to 的过去式代替。

I must finish my work today. 我今天必须完成我的工作。

You mustn't work all the time. 你不能老是工作。

Must I return the book tomorrow? 我必须明天还书吗?

After such a long walk, you must be tired. 走了这么长的路,你一定困了。

He must be the man I am looking for. 他一定是我要找的人。

He had to go because of somebody's calling him that day. 那天他要走是因为有人叫他。

must + have + 过去分词,表示现在对过去事物的推测。

He must have told my parents about it.

他一定把这件事情告诉我父母亲了。

He must have received my letter now.

他现在一定收到我的信了。

It's six o'clock already, we must have been late again.

已经六点钟了，我们一定又迟到了。

must 和 have to 的区别: must 表示说话人的主观思想, have to 表示客观需要。

You must do it now.

你必需现在就干。(说话人认为必须现在干)

I have to go now.

我得走了。(客观条件必须现在走)

need 需要 多用在否定式或疑问句中.

Need I attend the meeting tomorrow?

我需要明天参加会议吗?

You need not hand in the paper this week.

这一周你不必交论文。

need 是一个情态动词, 他的用法完全和其他情态动词一样, 但 need 还可当作实义动词使用, 这时 need 就象其他动词一样,有第三人称,单复数, 后面加带 to 的动词等特性。

I need a bike to go to school.

我上学需要一辆自行车。

Do you need a dictionary?

你需要词典吗?

She needs a necklace.

她需要一条项链。

needn't + have + 过去分词 表示过去做了没必要做的事情。

You needn't have taken it seriously.

这件事情你不必太认真。

dare 敢 多用在否定或疑问句中。

The little girl dare not speak in public.

小女孩不敢在公众面前说话。

Dare you catch the little cat?

你敢抓小猫吗?

dare 除用作情态动词外,更多的是当实义动词使用, 用法同实义动词一样,要考虑人称,单复数,时态等。

Do you dare to walk in the dark?

你敢黑夜走路吗？

He doesn't dare to tell the teacher what happened that day.

他不敢告诉老师那天发生的事。

[编辑本段]ought，will ，Shall, should，have to

ought 应当,应该 后面跟带有 to 的动词不定式。

You ought to read these books if you want to know how to repair the motorcar.

如果你想知道如何修理汽车,你应该读这些书。

You ought to bring the child here.

你应该把孩子带来。

ought + to have done 句型。指过去动作,表示一件事情该做而未做。

You ought to have been here yesterday.

你昨天就应该来。

ought not to have done 句型。表示一件不该做的事情却做了。

You ought not to have taken the book out of the reading-room.

你不应该把书带出阅览室。

will (would)决心,愿望。 would 为 will 的过去式,

可用于各人称。

I'll do my best to catch up with them.

我要尽全力赶上他们。

I'll never do it again, that's the last time.

我再不会做那件事情了,这是最后一次。

He said he would help me.

他说他会帮助我。

will, would用于疑问句表示说话人向对方提出请求或询问,用 would 比 will 更婉转,客气。

It's hot. Will you open the windows?

天气太热了,你能打开窗户吗?

Will you help me to work it out?

你能帮我解这道题吗?

Would you like some coffee？

给你来点咖啡怎样？

Shall, should表示命令,警告,允诺,征求,劝告,建议惊奇。

You should hand in the exercise book.

你应该交作业本儿了。

This should be no problem.

这应该没问题。

Shall we go now.

我们现在可以走了吗?

Why should I meet him？

为什么我要见他?

have to,不得不,必须,表示客观条件只能如此, 而must 则表示主观思想必须。

I have to go now.

我现在得走了。

I have to cook for my child.

我得给孩子做饭。

You must be here on time next time.

你下次一定要按时来。

We must go to get the timetable ourselves.

我们一定要自己去拿时刻表。

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