混合条件句

【归纳】

　　混合条件句又称错综时间虚拟条件句，指主句和从句所指的时间不一致，动词的形式需要根据表示的时间来调整。如：

　　1. 事实：I did not catch the bus this morning, so I am late now.

　　条件句：If I had caught the bus this morning, I would not be late now.

　　条件从句表示与过去事实相反的假设，而主句表示与现在事实相反的结果。由此可知，混合条件句可以用来谈论"想象的过去事件可能对现在造成的影响"。其构成形式是：If +主语+ had done, 主语+ would +动词原形。

　　2. 事实：I am not good at French. I did not understand what that man said.

　　条件句：If I were good at French, I would have understood what that man said.

　　条件从句表示与现在事实相反的假设，而主句表示与过去事实相反的结果。由此可知，混合条件句可以用来谈论"非真实的想象中的现在状态可能对过去造成的影响"。 其构成形式是：If +主语+动词过去式（be过去式用were）, 主语+ would +have done。

【即学即练】

I. 将下列句子改写为虚拟条件句。

1. I didn't learn Chinese, so I am not able to translate this passage for you.

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2. Simon forgets his wallet, so he didn't buy the book.

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