英语北师大版一轮复习讲练：Part II 语法部分专题9 状语从句_高考复习指南

　　Don't speak until (you are) spoken to.

　　Do come to see me whenever (it is) possible.

　　(2)在比较状语从句中，可省略与主句相同的部分。

　　I know you more than he (knows you)．

　　Tom is two years older than Alice (is)．

　　(3)as (尽管)引导让步状语从句倒装时，表语提前，且其前的冠词要省略。

　　Hero as he is, he has shortcomings.

　　2．时态的替代

　　(1)在时间、条件和让步状语从句中须用一般现在时替代一般将来时，用一般过去时替代过去将来时。

　　If it rains tomorrow, we won't go fishing.

　　Don't get off the bus until it has stopped.

　　(2)The more...the more...句型中，前句起条件状语从句作用，故用现在时表将来。

　　The harder you work, the greater progress you'll make.

　　(3)after, before, as soon as等连词本身就暗示了时间的先后，因此可用一般过去时代替过去完成时，而不会产生时间上的混乱。

　　I went to bed after I (had) finished my homework.

　　The film star (had) left before the reporter arrived.

　　He got down to work as soon as he (had) go to the factory.

　　3．语序的倒装

　　(1)no sooner...than..., hardly / scarcely / barely...when...句型中的主句常用过去完成时，从句常用一般过去时，且置于句首时主句要倒装。

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