He must have been asleep at that time,(wasn't) he?為什么是用 wasn't 而不是 didn't
He must have been asleep at that time,(wasn't) he?為什么是用 wasn't 而不是 didn't
英語人氣：861 ℃時間：2019-10-20 00:10:34
優(yōu)質(zhì)解答
情態(tài)動詞表示推測的句子,完成反義疑問句時,首先要去除推測,還原成普通句子.故He must have been asleep at that time根據(jù)at that time 為過去時間,需還原成：He was asleep at that time.中間為be動詞的肯定式,故為...那“Tom must have seen the movie last night，didn't he ？”這里為什么用“didn't”？last night該用一般過去時，故原句還原成： Tom saw the movie last night, didn't he?但：Tom must have seen the film before, hasn't he?原因是：before 置于句末常用完成時，故夲句應還原成：Tom has seen the film before,hasn' t he?
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