He didn't 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……"(=if…not)

　　[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 won't go unless he comes to invite me himself.

　　除非他本人来邀请我，不然我是不会去的。

　　I won't attend his birthday party unless invited (=unless I am invited). 除非被邀请，否则我不

　　去参加的生日晚会。

　　句型15

　　when引导的从句

　　when除了用来引导主语从句、宾语从句、时间状语从句、表语从句和定语从句，还有一种用法值得关注，那就是when引导并列分句，意思是"这 时突然;就在那时"，强调另一个动作的突然发生。常用于以下句型中：(1)、主语 + be doing… when…意思是"正在做某事这时……";(2)、主语 + be about to do…when…;(3)、主语+be on the point of (doing) …when…意思是"正要去做某事这时……"

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