情态动词后接完成时
■表示对过去情况的推测
1. must have +p. p. 一定已经
2. can/could have + p. p. 可能已经
3. may/might have + p. p. 或许已经
用例:
he must have taken the book since it isn’t here. 他一定是把书拿走了,因为书已不在这里了。
what could have become of him now? 现在他可能怎么样了呢?
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