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一 Can 的用法：
1. 表示能力.Although he is only five , he can play the piano.
2. 表示请求允许（may）:Can I use your computer? 3. 疑问句,否定句 表可能性 That can’t be Mary, for she is in hospital.
表客观的的可能性（人或事物的特征）Accident can happen on such rainy days.
4.表惊讶，怀疑，不相信的态度。How can that be true! I can’t believe my eyes and eyes.
现在 am/is/are able to
Be able to :强调经过努力能够做某事 过去 was /were able to
注意 将来 will be able to
现在 can
Can ：本身具有的能力 过去could
将来can （只限条件句中）he can come tomorrow.
区别：If you have a good sleep, you can(will be able to) work out this problem.
The fire spread through the hotel very quickly but everyone was able to get out.(成功了)
I could have worked out the problem, but I was too nervous. (未做)
二 could的用法：
1.表过去的能力：When I was young, I could climb any tree in the forest.
2.表委婉的语气，用来婉转地提出请求，允许。Could you show me the way?
3.表推测现在的推测：语气较can弱.Someone is knocking at the door. Who could it be?
过去的推测: He said the news could be true.
4.表惊讶 How could you be so careless! Could this be true?
5.表虚拟（见虚拟语气）
三 may的用法：
1.表允许、许可。否定回答是要用mustn’t —May I use your computer?—yes, you may/no, you mustn’t.
2. May +do 表对现在或未来的推测：This coat may be Peter’s.
May+ have done 表对过去的推测:she may have been beautiful once, but she is not anymore.
3.用于祈使句中，表祝愿，愿望。May you succeed! May god bless you!
4.用于让步状语从句中。Whoever may say so, it is not true.无论谁这么说，它都不会是真的。
5.带may的习语。May/might as well do=had better 还是….的好。It’s too late. You may/might as well not go.
（1）Can 可表许可，但may比较正式，更礼貌。May not 表否定，但较客气。
You may not leave things half done.不要
注意 （2）May not 不可 shall not 不许（语气强）
（3）回答 May I…? may not 不可以
Can I…? may not 可能不
（4）可以不。You may not attend the meeting.
（5）可表肯定意味的“当然可能”=can It is so quiet that one may hear a pin drop.
四 Might 的用法：
1.He asked if he might go home.他问他是否可以回家。
现在的 较may、 can、 could更礼貌。Might I be away early?
2.现在的推测：可能性较may小。He might come tomorrow, but I am not quite sure.
过去的推测：He told me he might be late.
3.表虚拟（见虚拟语气）
4.might 用于虚拟语气，可表“责备”“忠告”只用于肯定句中。You might at least have said hello to me .你至少可以和
我打个招呼！
五 will的用法
1.Will we buy a car? 我们要买一辆车吗？【译林版高中情态动词】
I will do my best to help you. 我愿尽力帮你。
I won’t do so .我不愿那么做。
2.表允许、邀请、请求。只用于第二人称。Will you give me a piece of paper.你可以给我一张纸吗？
3.表推测、估计。意为：“可能、想必、大概” This will be the book you are looking for, I think.我想这可能是你的书。【译林版高中情态动词】
4.表示经常性、习惯性、倾向性。意为“经常、惯于、总是”。Oil will float on water.油总是浮在水上。
比较 The door won’t open .门就是不开
The radio doesn’t work. 收音机坏了
5.表示功能。“能、行” This will do if there is nothing better.如果没有更好的，这个也行。
6.表规律性的“注定会”。 You will fail if you don’t work hard .如果你不努力，注定会失败。
7.用于祈使句的附加疑问句中。Turn on the radio, will you? 请你打开收音机，好吗？
六 would的用法：
1.will的过去式。She said that she would do it.
2.表请求或征求对方意见，较will更客气。用于疑问句中。Would you like to have a glass of wine?
3.表推测 现在的推测，较will弱
过去的推测。
4.表过去的习惯性动作或某种倾向。On Sundays he would sit for hours saying nothing.星期天他总是一坐几个小时，一
直不发言。
5.would not表示坚决地拒绝。He would not let me enter the classroom.他拒绝让我进教室。【译林版高中情态动词】
6.would 代替I wish 表决心或意志、祈愿，句中用虚拟语气。Would I were a bird! 但愿我是只鸟儿！
7.带would的习语
would rather/sooner 宁愿
would/should prefer 较喜欢，宁愿
would rather + do + than +do 宁可…而不愿…
would rather/sooner +have +done 过去宁愿
would like to do sth. 愿意 Do you like music?
Would you like some tea?
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