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《Grammar》最新PPT课件优质课下载
couldn’t, needn’t, should, might, must
1. Come on! You ______ have finished this task hours ago.
2. She suddenly fell down on her way to school; she _____ have
been ill.
3. She ________ have seen me because I wasn’t there at all
yesterday.
should
must
couldn’t
4. I can’t find my keys. I _______ have left them at the school yesterday.
5. There was plenty of time; she _______ have hurried.
以上结构皆为“情态动词+have done”结构。
might
needn’t
couldn’t, needn’t, should, might, must
【语法精点】
一、基础点拨
情态动词+have done的用法归纳:
1. may / might + have done。
表示对不太把握的过去情况的可能性推测，表示“可能/ 大概(已经)做了某事”的意思。
﹡Tom may have gone to Shanghai，but I’m still not sure about it.
汤姆可能已经去了上海，但是我还不能肯定。
2. can / could + have done。
表示对过去的推测，用于否定句、疑问句中，还可以表示“本来可以做；可能已经做”。
﹡She can’t have been to your house. She doesn’t know your address.