7. before
[误]We have two hours to kill before we will go home.
[正]We have two hours to kill before we go home.
[析]kill time意为消磨时光。
英语状语从句中要用一般现在时表示将来的动作。如:If it rains we will not go to the park.
[误]I did this work two days before.
[正]I did this work two days ago.
[析]用ago组成的时间状语其主句中的谓语动词要用过去时,而before引起的时间状语其主句中的谓语动词多用完成时,如:I has done this work a few days before.
before, long, long before
before long是不久之意,例如:I shall go to America before long. 而long before则是很久很久之意,如:We knew this teacher long before we saw him. (我们在看到这位老师之前很久就知道他了。)
8. begin
[误]The meeting will begin from Monday.
[正]The meeting will begin on Monday.
[误]The film has begun for ten minutes.
[正]The film has been on for ten minutes.
[析]begin是瞬间动词,所以它的完成时态不能接表示一段时间的状语,如:The film has begun. 这句话是对的,即电影已经开始。但要讲已经开始10分钟了则要用has been on即上演了10分钟。
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