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《Grammar and usage(1)： Modal verbs： general introduction》最新PPT课件优质课下载
Her mother can speak French.
The wounded man was still able to get to the village and was saved by the villagers in the end.
(2)表示猜测“可能”，一般用于疑问句和否定句。
—Can the news be true?
—It can’t be true.
Someone is knocking at the door.Who could it be?
(3)can可以表示理论上的可能性，指常有的行为或情形，意为“有时会……”。
Anybody can make mistakes.
(4)表示请求、允许(表请求时，口语中常用could代替can使语气更委婉，回答时用can)。
Can I go now?
—Could I come to see you tomorrow?
—Yes，you can.(否定答语可用No，I’m afraid not.)
(5)表示惊异、怀疑、不相信的态度(主要用于否定句、疑问句或感叹句中)。
How can that be true？I can’t believe my eyes and ears.
How could you be so careless?
(6)can的特殊用法。
can but只有；can’t but不得不；can’t...too再……也不为过，越……越好
I can but wait.
I can’t but wait.
You can’t be too patient to the customers.
题组训练1
用can，could，be able to的适当形式填空
1.Though the building was on fire，they go out safely.
2.It be the postman at the door. It’s only six o’clock.
3.—How’s your new babysitter?