1. can/be able to
(1) can表示“本能”或能够,有一般时和过去时,后接动词原形一起构成谓语。
I can sing the English song.我会唱这首英语歌。
A baby can cry when it is hungry.婴儿饿的时候会哭闹。
(2) be able to后接动词原形,表示“能够”,多指一个人经过后天的努力从而获取的一种“能力”,有各种时态。
If you work hard, you will be able to master English.只要你努力,你一定能掌握好英语。
2. catch a cold/have a cold
一般情况下,这两个短语都表示“得了感冒,患了感冒”,但有所侧重:
(1) catch a cold强调动作。如:
It's coldoutside. Go into the house or you'll catch a cold.
外面冷。到房间里去吧,不然你会感冒的。
(2) have a cold强调状态。
I have had a cold for several days and I can't get rid of it.
我感冒已经好几天了,可还是好不了。 |
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