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).
③as(尽管)引导让步状语从句,表语前的冠词要省略。
Hero as he is, he has shortcomings.
④其他省略。
Please drop in any time you like.
Is it going to rain? If so, I'll stay at home; but if not, we will go out.
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.
②The 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.
③after, 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.
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