自学T＿T　虚拟语气1　if

时间：2008-06-13 08:29 | 分类：学习笔记 - 语法

if句型

（资料来源于网上）

I. 三种主要句型
　　1.与现在的事实相反
　　从句用一般过去时，主句的谓语用would （could, might）＋动词原形

　　if v-ed, would/could/might + v
　　If I were Bill Gates, I would not work so hard every day.

　　2.与过去的事实相反
　　从句用过去完成时，主句的谓语用would （could, might）＋现在完成时

　　if had v-ed, would/could/might + have v-ed

　　If I had gone to America when I graduated from middle school, I would have got my PhD degree.

　　3.与将来的事实相反
　　从句用should （were to, did） +动词原形，主句的谓语用would （could, might）＋动词原形
　　if should/were to/did + v, would/could/might + v
　　If it should / were to snow tomorrow, I would go skiing.

II. Remarks
　　1.虚拟语气条件句中省略if，则主谓要倒装。
　　Had he worked harder, he would have got through the exam.

　　2.条件句发生的动作和主句发生的动作不一致，（例如：条件句动作发生在过去，主句的动作发生在现在）谓语动词要根据表示的时间进行调整。
　　If you had taken the medicine yesterday, you would feel much better now.
　　If I were you, I wouldn‘t have missed the film last night.

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