(共23张PPT)
考点0.can的用法
1.表示能力,意为“能;会”,有时可与 be able to互换。
e can swim
e is able to swim.他会游泳。
注意】can与 be able to也有区别。
can和 be able to表示能力时意义基本相同,但can只有
现在时和过去时( could),其他时态要用 be able to
Jim couldnt speak Chinese last year, but now he can
去年吉姆还不会说汉语,但现在他会了。
2.表示推测,意为“可能”,常用于否定句和疑问句中
can't意为“不可能”
Can the news be true 这个消息是真的吗
3.表示请求和许可。
Can i go home now (请求)
Of course, you can./No, I'm afraid you cant (iFa]/
不许可)
【考点专练】
Can I swim in the river, Grandpa
B. It's dangerous
A. Yes, you can
B No, you cant
C. Yes, you need
D No, you needn
2 Reading a large number of books A make us wiser
The more we read the more we know
can
B. would
need
D. must
3 The Jiuli Lake is so beautiful that lots of tourists C
wait to enjoy its view
A neednt
B. mustnt C cant
need
考点已comd的用法
1. could为can的过去式,意为“能;会”,表过去的能力。
He could ride a bike when he was five
他五岁时就会骑自行车。
2. could用于疑问句中,表示请示或征求意见。语气比
can更委婉,但没有过去的意思。
Could you help me 你能帮我吗
注意】MayI. 或 Could you… 开头的表示请示或
征求许可的疑问句,否定回答常用can't
3. could表猜测。
He could be at home.他可能在家。(语气比较弱)