情态动词的用法归纳终极版.docx

情态动词的用法要点
情态动词的基本用法
1．Can could 表示能力，允许和有把握的推断
2．May, might 表允许、祝愿，表推测语气轻如棉
3．Must 表必须、必要，表推测预期重如山
4．Shall 用于一三人称征求naged to do 或 succeed in doing。如：
After the accident it was a long time before she was able to walk again.
The fire was very big, but most people were able to escape from the building.
（3） 惯用形式“cannot…怡。…”表示“无论怎么 也不（过分）”。如:
You cannot be too carefu l 你越小心越好。
惯用形式“cannot but+不定式（不带to）”表示“不得不，只好”。如:
I cannot but admire her determination 我不得不钦佩你的决心。
二 may 和 might
情态动词
用法
例句
may/might
表示允许、许可。否定回答一般用must not/mustn't, 表示 禁止、阻止 之意，但也可以用had better not （取好别）或may not （不可以），语气较为委婉。
May I come in and wait?
May I smoke here?
No, you mustn't(或 No, you'd better not.)
在表示请求、允许时，might比may语气更委婉 些。用May I征询对方许可在文体上比较正式， 在口气上比较客气，在日常用语中，用Can I征询 对方意见更为常见。
Might I borrow your pen?
I wonder if I might speak to your son.
表示可能性的推测，通常用在肯定句和否定句中， 含有“或许”“大概”“可能”之意；用might代 替may时，则语气显得更加不肯定。
It may rain this afternoon.
She might come to join us this afternoon.
I suppose he might have missed the train.
may用于祈使句表示祝愿
May you succeed.
Long may he live!愿他能持续住下去。
May you have many more days as happy as this one.
May she rest in 。
惯用句式：
may well+动词原形，意为 兀全能，很可能， 相当于 to be very likely to
“may as well 或 might（just）as well+动词原形”意 为取好，满可以，倒不如,相当于had better 或 there is no reason to do anything else.
1. It may well change forever the way you look at Greek art.