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再怎样也不为过,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 were able to
go out safely.
2.It can’t be the postman at the door. It’s only six o’clock.
3.—How’s your new babysitter?
—We could not ask for a better one. All our kids love her so much.
4.The police still haven’t found the lost child,but they’re doing all they can.
5.You can’t be too careful when driving.
2.may和might的用法
(1)表示允许、请求,might比may的语言更委婉一些。
—May I watch TV now?
—Yes,you may.(Yes,please.)
—No,you mustn’t.(No,you’d better not.)
(2)表示可能性时,might比may的可能性小,may表示的可能性比can小(主要用于陈述句、肯定或否定句,疑问句用can代替)。
The story may not be true.
(3)表示祝愿(不用might)
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