if引导虚拟条件句的用法

如题所述

虚拟语气if的三种用法如下:

表示与现在事实相反的情况、表示与过去事实相反的情况、表示与将来事实相反。

表示与现在事实相反的情况:  

1、从句:If+主语+动词一般过去时(Be动词用were)。  

2、主句:主语+ should/would/might/could+do。 

3、例句:If I were you,I would take an umbrella。

表示与过去事实相反的情况:

1、从句:If+主语+had+done。  

2、主句:主语+should/would/might/could+have done。

3、例句:If he had taken my advice,he would not have made such a mistake。

表示与将来事实相反:  

1、从句:if+主语+were to do。  

2、if+主语+should+do。  

3、if+主语+动词一般过去式(be动词用were)。

4、例句:

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