(1)在when, while, whenever, till, as soon as, if, unless, as if/though, as, whether等引导的状语从句中,若谓语部分含有be动词,而主语又跟主句主语相同或从句主语为it时,则从句中主语和be动词常被省略。
Wood gives off much smoke while (wood is) burning.
木头燃烧时产生很多烟。
His opinion, whether (it is ) right or wrong, will be considered.
他的意见,无论对错,就会被考虑。
I’ll buy a TV set if (it is) necessary. 如果有必要我就买一台电视机。
(2)在as, than, however, whatever, no matter what等引导的从句中常省略某些成分。
After two hours she became quieter (than she had been).
两个小时后,她变得更安静了。
(3)虚拟条件句常省略if,并将were, had, should提前构成部分倒装。
Should there be a flood(=If there should be a flood), what should we do?
如果发生了洪水,我们该怎么办?
Had he taken my advice(=If he had taken my advice), he would be a college student now.
如果他接受了我的建议,他现在就是一名大学生了。
Were she my daughter(=If she were my daughter), I wouldn’t allow her to study abroad.
如果她是我女儿,我不会允许她到国外学习。
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