18.must 表推测
(1) 对现在事实的推测,用 must be/do sth.
对过去事实的推测,用must have done
He must be over 70 now. 他现在肯定有70多岁了。
He knows something about Beijing. I think he must have been there.
他对北京有所了解,我想他一定去过那儿。
(2) 表推测否定形式为 can't do, can't/couldn't have done。
He can't be from America, for his English is not good at all.
他不可能是从美国来的,因为他的英语一点也不好。
He can't have bought this book, for he is reading mine.
他不可能买了这本书,因为他正在看我的。
(3) 含must表推测的句子,反意疑问句应根据实际时态的动词形式决定。
He must be Mr. Chen, isn't he?
(去掉must后的陈述句为:He is Mr. Chen.)
He must have stayed at home yesterday, didn't he?
(还原为: He stayed at home yesterday.)
You must have met him before, haven't you?
(还原为:You have met him before.)
高考链接:
(1) ---Tom graduated from college at a very young age.
---Oh, he ____ have been a very smart student. (NMET 2004)
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