这两词既可做实义动词用，又可做情态动词用。作为情态动词，两者都只能用于疑问句，否定句和条件句。 need 作实义动词时后面的不定式必须带to，
带to 的情态动词有四个：ought to, have to, used to, be to, 如加上have got to ,(=must), be able to，为六个。它们的疑问，否定形式应予以注意： Do they have to pay
问句 肯定回答否定回答 Need you…?Yes, I must. No,I needn't Must you…? /don't have to. 典型例题 1）---Could I borrow your dictionary?---Yes, of course, you____. A. might
注意： 1）would like； Would like to do = want to 想要，为固定搭配。 Would you like to go with me? 2）Will you…? Would you like…? 表示肯定含义的请求劝说时，
would rather do would rather not do would rather… than… 宁愿……而不愿。 还有would sooner, had rather, had sooner都表示“宁愿“、“宁可“的意思。 If I have
had better 相当于一个助动词，它只有一种形式，它后面要跟动词原形。had better do sth had better not do sthIt is pretty cold. You'd better put on my coat.She'd better not play
should 和ought to 都为“应该“的意思，可用于各种人称。---Ought he to go?---Yes. I think he ought to.表示要求，命令时，语气由 should（应该）、had better最好）、m
1) may(might) have + done sth, can (could) have + done sth 表示过去，推测过去时间里可能发生的事情。Philip may (might) have been hurt seriously in the car accident.Philip can (cou
can, could, may, might, must 皆可表示推测，其用法如下： 1）情态动词+动词原形。表示对现在或将来的情况的推测，此时动词通常为系动词。I don't know where
1) must用在肯定句中表示较有把握的推测，意为“一定“。 2) must表对现在的状态或现在正发生的事情的推测时， must 后面通常接系动词be 的原形或