条件句由两部分组成: if从句+主句:
If it rains I shall stay at home.
如果下雨我就呆在家里。来源
:考试大
If it rains是 if从句, I shall stay at home是主句。条件句有三种,每种所含的一对时态都不一样。每种条件句内还可能有某些变化,但初学条件句者可不必理会这些变化,而把注意力放在条件句的基本形式上。
条件完成时
这种时态由would/should+完成式构成:
肯定式: I would/should have worked
you would have worked等来源:考试大
否定式: I would not/should not have worked等
疑问式: would/should I have worked?等
否定疑问式: should I not have/shouldn’t I have worked?
would you not have/wouldn’t you have worked?
这种形式用于:
(a)条件句中。
(b)would和should的特殊用法中。
(c)过去时中,相当于将来完成时:
I hope he will have finished before we get back.
我希望在我们回来之前他已经做完。
I hoped he would have finished before we got back.
我曾经希望在我们回来之前他已经做完。
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