4.表示惊异、怀疑、不相信等态度,主要用于否定句和疑问句中。 How can you be so careless 你怎么这么粗心? Where can could they have gone 他们会去了哪里? He can'tcouldn't be over sixty. 他不可能超过60岁。
5.Could可以用在虚拟条件句中。 If I could fly, I should be very happy. 如果我能飞, 我会很高兴。 If you had followed my advice, you could have finished it.如果你当时听我的,你早就做完了。If you had tried harder, you could have passed your exam.
如果你再努力些,你就能通过考试了。
6.can与be able to的区别
①can表示“能力”时,和be able to相当,许多场合都可以互相替换。但当叙述过去经过一番努力才能完成的事情或前面有特殊说明,表示你有能力时,只能用be able to。【正】Can you speak any foreign languages 你会说外语吗? 【正】Are you able to speak any foreign languages 你会说外语吗? 【误】The fire spread the building quickly but everybody could escape. 【正】The fire spread the building quickly but everybody was able to escape. 大火迅速蔓延到整幢大楼,但大家都逃了出来。 【正】The fire spread the building quickly but everybody managed to escape. 大火迅速蔓延到整幢大楼,但大家都想法逃了出来。
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