句型13
until.直到时候notuntil直到才
[例句]
You are to stay until/till your mother comes back. 你得等到你妈妈回来。
The meeting was put off until ten oclock. 会议推迟到十点钟。
The villagers didnt realize how serious the pollution was until all the fish died in the river.
Not until all the fish died in the river did the villagers realize how serious the pollution was.(倒装句)
等到湖里的鱼全死光了,村民们才意识到污染是多么严重。
He didnt go to bed until his mother came back.
It was not until his mother came back that he went to bed.(强调句)
Not until he failed in the exam did he realize that he had wasted much time playing computer games.
Not until his son came back from school did he go to bed.
句型14
unless除非,如果不(=ifnot)
[例句]
I shall go tomorrow unless it rains. 如果不下雨,我明天去。
-Shall Tom go and play football?
-Not unless he has finished his homework. 除非他完成作业,否则不能出去。
I wont go unless he comes to invite me himself.
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