英语六级语法精要条件句

　　英语六级语法精要：条件句 条件句 虚拟条件句主要有下面两类: 表示现在及将来情况:

　　谓语主要形式如下:

　　would + 动词原形

　　If I were you, I wouldnt lose heart.

　　How nice it would be if you could stay a bit longer.

　　表示过去情况的虚拟条件句, 谓语主要形式如下:

　　would have + 过去分词

　　She would have come if we had invited her.

　　If I hadnt taken your advice, I would have made a bad mistake,

　　You wouldnt have caught cold if you had put on more clothes.

　　有时候, 条件从句表示的动作和主句表示的动作, 发生的时间是不一致的. 这时, 动词的形式要根据表示的时间来调整. 这种句子可以称为错综时间条件句.

　　If he had received six more votes, he would be our chairman now.

　　If we hadnt got everything ready by now, we should be having a terrible time tomorrow.

　　有时假设的情况并不以条件从句表示, 而是通过一个介词短语来表示.

　　Without music, the world would be a dull place.

　　We could have done better under more favorable conditions.

　　That would have been considered miraculous in the past.

　　But for the storm, we should have arrived earlier.

　　如果条件句从句中包含有 were, had, should 或could, 有时可把if省略掉, 并把were, had, should或could放在主语前面.

　　Had we made adequate preparation, we might have succeeded.

　　Should there be a flood, what should we do?

　　Were it not for their assistance, we would be in serious difficulty.