can，might，may，could，must的用法

can，might，may，could，must的用法

can 能,有能力做某事..(没有任何推测的意思.)
he can understand her meaning.他能理解她的意思.

may/ might 通常用于肯定或否定陈述句中。当表示某事可能发生时，可用could，may，might .如： — Are you coming to Jeff’s party？

你来参加杰夫的晚会吗？

— I’m not sure. I may/ might go to the concert instead.

不太确定，我有可能去参加音乐会。

may 可能.. (它的可能性要比might大)

could 用于虚拟语气中.或是委婉的语气中(希望能得到别人肯定回答的). 和can的意思一样. "能".
If I could go with you, I should feel very glad.如果我能跟你一起去,我会很高兴的.(但事实上没有跟着去.这就是所谓的虚拟语气.)
could I borrow you pan? (这里就是委婉的语气,比用can更客气些.多用于生人之间).

could 也是can的过去式形式.

must 一定,是对某事百分百地肯定..he must have finished homework."他一定做完了作业"../ tomorrow will must be rainy.明天一定有雨.
must 也有"务必,必须"的意思.表强制性. you must do it!/

情态动词记忆口诀: 情态动词两要点;动词原形跟后面,说话语气较委婉,can表"能力"may"许可",must"责任"或"义务",否定回答"needn't"换;should"应该",would"愿",have to "被迫"表客观. 注释:对must构成的一般疑问句作否定回答只能用needn't. can的用法 1. 表能力 can your sister skate / can you sing / can you dance 2. 表示可能性 can you go with us we can go there by bus. 3. 表示同意做某事,意为"允许","可以" you can go now. can i have a look at your photos 4. 表推测(主要用于否定句,疑问句) it can't be jay zhou. he can't be thinking about something. must的用法 1. 表示按命令,规定,责任等必须要做的事. you must do all the homework by yourself. you mustn't park your car here. 在回答由must引导的一般疑问句时,如果表示肯定,用must;如果表示否定,要用needn't. -must i come here tomorrow -yes, you must. (no, you needn't.) 2. 表示肯定的推测,意为"一定会","一定是",多用于肯定句. it must belong to karla. he must be happy. you must be joking. must和have to 的区别是:must表示说话人的主观意愿,而have to 则表示客观要求,意为"不得不". you must tell us what you have seen. he had to walk home because the bus had left. need的用法 need除了可用作行为动词外,还可用作情态动词,作为情态动词使用时,多用于疑问句和否定句,后面直接跟动词原形,作为行为动词时,后面跟带to的动词不定式. 他需要现在去看医生吗 does he need to see a doctor now need he see a doctor now need作为情态动词,意为"需要",无时态和人称的变化. they needn't hand in their homework now. need i stay with you (肯定回答为:yes, you must. 否定回答用no, you needn't.) may的用法 1. 表示"可以",用以询问或说明可否做某事. may i use your pencil you may come here tomorrow. (在回答由may引导的问题时,常以yes, please或certainly来表示允许或同意,而用please don't 或no, you mustn't来表示不允许和反对.) 2. 用于表推测某事可能发生或某情况可能存在,意为"可能",一般不用于疑问句. it may rain this afternoon. she may still be in the classroom.