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will的基本用法
(1)用于各人称，可以表示“意志”或“决心”，
如：I have told him again and again to stop smoking, but he will not listen.
(2)在疑问句中用于第二人称，表示说话人向对方提出请求或询问对方的意愿，
如：Will you please tell me how to get to the Capital Gymnasium?
(3)will可以表示一种习惯性的动作，有“总是”或“会要”之意，
如：Every morning he will have a walk along this river.
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would的基本用法
(1)would作为will的过去式，可用于各人称，表示过去时间的“意志”或“决心”，
如：He promised he would never smoke again.
(2)在疑问句中，用于第二人称，表示说话人向对方提出请求或许问对方的意愿时，比用will的气更加婉转， 如：Would you like some more coffee?
(3)在日常生活中，学用“I would like to…”表示“我想要”或“我愿意”之意，以使语气婉转，
如：I would like to do exercise first.
(4)would可以表示过去的习惯动作，比used to正式，并没有“现已无此习惯”的含义。
如：Last year our English teacher would sometimes tell us stories in English after class.
During the vacation he would visit me every week.
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 about it.
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，
例如：He told us he used to play football when he was young.
(2)had better意为“最好”，后接不带to的不定式，
例如：---- 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：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，
(4)例如：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，
例如：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)
总结
各自特别含义 通用含义
Must必须；非要 mustn’t 禁止
Can Could 能；可以；常常；究竟
May 表示祝愿 Might Might as well不妨 允许；可能
Shall 规则；许诺；命令；决心 Should 应当；竟然 提出或征求意见
Will Would 要、会；真理、事实
Need 需要 Dare 竟敢
