今日目标：情态动词（掌握6个小知识点即可）
1 Can表示能力，可能性，许可，惊讶的语气等These difficulties we can and must conquer.
He can be very naughty.他有时很调皮
You can’t smoke here.
He can’t be more than 30.
2 Could可以表示can的过去式、用法与can类似，语气上更婉转；
She could sing very well when she was a girl.
Could you show me how to do it?
How could you be so stupid?你怎么可以这么傻？
She felt miserable she could have cried.
I could have died laughing.
3 May用来提出问题、允许、可能、祝愿、和well连用表示很可能、may as well 表示不妨
May I have the key?
A fool may give a wise man counsel.
May God bless you.
If that is the case, you may as well try.
4 Might表示可以、可能等
He suggested one or two books which they might buy.
If I knew them better, I might invite them to dinner.
A lot of men died who might have been saved.
5 Must表示必须、一定
You must keep it a secret.
A work ill done must be done twice.
The teacher must not favor some children than others.
注意must的反义用needn’t. Must I come at 4? No, you needn’t.
6 Ought表示应该、建议等
He ought to be isolated.
You ought to be prepared for something unpleasant.
It ought to be ready by now.
Jack ought to have arrived by now.
网友评论