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精编密训教材，分阶快递。考博英语语法重点总结（7）
(7) if it were not for…与现在事实相反， if it had not been for与过去事实相反，两个都相当于but for：
If it had not been for his help(=but for his help),we would not have succeeded.
(8) 虚拟语气用于as if(though)引起的方式状语从句和表语从句中，其动词形式与wish宾语从句的形式相同。例如：She often laughs spontaneously, and her good humor breaks out as brightly as if it were a part of the sunshine above.她常常发出发自内心的微笑，而且她那美好的情绪像天上一道明亮的阳光一样，常常流露出来。
They talked as if they had been friends for years.他们交谈着，就好像他们是我年的老朋友一样。
She looks as if she would cry.她看起来好像要哭了。
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