与现在事

　　实相反 过去式

　　(be用were) would/

　　should/

　　could/might

　　do If he were here, he might be able to help.

　　What would you do if you were in his place？

　　与过去事实相反 had done would/

　　should/

　　could/might

　　have done If I had started a little earlier, I would have caught the train.

　　I could have done it better if I had been more careful.

　　与将来事实相反 过去式

　　were to do/

　　should do would/

　　should/

　　could/might

　　do If I were to do it, I would do it in a different way.

　　I would certainly go if I had time.

　　1.在具体运用中，条件从句中有时可省略if而采用倒装结构。如：

　　Had it not been for your help, we wouldn't have achieved so much.

　　2．介词without/but for、连词but、副词otherwise常用来表示某种假设条件。如：

　　I wouldn't have made such rapid progress without your help.

　　3．有时候从句动作和主句动作发生的时间不一致，这时谓语动词的形式要根据各自的时间来调整。如：

　　If the weather had been more favourable, the crops would be growing still better.

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