2019-2020同步外研英语必修四新突破讲义:Module 6 Section Ⅲ Grammar——情态动词+have done的用法 Word版含答案.pdf
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1、Section Grammar情态动词have done 的用法 语 境 自 主 领 悟 先观察原句 Many people think the monster may be a distant cousin of the Loch Ness monster in Scotland. They also think that there might be similar creatures in other lakes around the world. But in China,the idea of the dragon may have come from the alligator.
2、You might have given your parents more help earlier. It must have rained last night,for the road was quite muddy. He cant have forgotten it,for he talked about it yesterday. You ought to/should have done the job more carefully. You oughtnt to/shouldnt have asked such a foolish question. 后自主感悟 1.句表示可
3、能性的推测,意为“可能,也许” 。 2.句表示对过去发生的事情的推测,意为“可能已经” 。 3.句表示对过去事情的很有把握的肯定推测,意为“肯定做过某事” ,而句 则表示对过去发生事情的有把握的否定推测,意为“不可能做过某事” 。 4.句表示“过去本应该做却未做的事” ,句则表示“过去本不该发生却发生 了的事” 。 1may/might have done sth.表示对过去行为的推测,意为“也许/或许已经做 过某事” ,might 可能性更小,主要用于肯定句和否定句中。 John isnt at home.I think he may/might have gone to school. 约
4、翰不在家,我想他可能去上学了吧。 You might have read about it in the newspapers. 你可能已经在报纸上看到这个消息了。 名师点津 might have done 有时表示 “本来可以做的事而实际上没有做” , 含有 “劝告, 责备”的语气。 You might have been more careful. 你本来可以多加小心的。 2must have done sth.表示对过去发生的事或行为的肯定推测,意为“一定做 过某事” ,只用于肯定句中。 He reasoned that since she had not answered his le
5、tter she must have left here.他 推断,由于她没有给他回信,她一定是已经离开这里了。 名师点津 含有 must have done 结构的反意疑问句中,若有表示过去的时间状语,反意疑 问部分用“didnt主语?” ;若没有表示过去的时间状语,反意疑问部分则用 “havent/hasnt主语?” 。 They must have gone there last night,didnt they? 他们昨晚一定是去那里了,不是吗? They must have been to the Great Wall,havent they?他们一定去过长城,不 是吗? 3can/
6、could have done sth.是对过去的推测,表示“可能做过某事” ,主要用于 否定句和疑问句中。could 语气较委婉,肯定句中一般用 could 不用 can。 Mr.Smith cant have gone to Beijing, for I saw him in the library just now.史密斯 先生不可能去北京了,我刚才还在图书馆见过他。 Where can they have gone? They could have gone to the cinema. 他们能去哪里呢? 他们可能去电影院了。 名师点津 could have done sth.还可表示
7、过去本可以完成而实际上未完成的动作。 You could have done better,but you were too careless. 你本来可以做得更好,但你太粗心了。 即时训练 1 用适当的情态动词填空 George cant have gone too far.His coffee is still warm. We are very worried about Tom.Why hasnt he come back? Dont worry.He may/might have been caught in a traffic jam. How did you do in the
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