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定了就要干 必须现在干( 四 )

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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 *** 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*** oke so much?
You oughtn't*** oke 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*** oke, but it was a long time ago.
I certainly did use to*** oke, 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“更好”，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“更好立即”）
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:

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