摘要：2． as if 从句用虚拟语气的情况. 当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时.从句虚拟语气动词时态的形式如下: (1)如果从句表示与现在事实相反.谓语动词用一般过去时 如: You look as if you didn t care． 你看上去好像并不在乎. He talks as if he knew where she was． 他说话的样子.好像他知道她在哪里似的. (2)从句表示与过去事实相反.谓语动词用“had+过去分词 . 如: He talks about Rome as if he had been there before． 他说起罗马来好像他以前去过罗马似的. The girl listened as if she had been turned to stone． 那女孩倾听着.一动也不动.像已经变成了石头似的. (3)从句表示与将来事实相反.谓语动词用“would／could／might+动词原形 . 如: He opened his mouth as if he would say something． 他张开嘴好像要说什么. It looks as if it might snow． 看来好像要下雪了. [同类预测] 即使是不再虚拟语气的知识中也可以见到对该知识的考查.所以对该结构的用法要做到全面掌握.
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完成句子
Then he _________(切断)the leather top of the shoe as if it _________(用be的适当形式填空)the finest steak．
as if
(1)It looks as if it _________(用be的适当形式填空)going to rain．
(2)She loves the boy as if she _________(用be的适当形式填空)his mother．
as if和as though引导的从句所叙述的情况与事实相反时，从句的谓语动词多用虚拟语气。在虚拟语气结构中，用________时态来表示现在的情形；用________时来表示过去的动作或状态；用________时表示正在进行的动作；用________时表示将要发生的动作。
当as if和as though从句的主语和主句主语一致，且从句中含有系动词be的某种形式时该主语和系动词可以省略。
例如：John paused as if(he was)expecting Mary to speak．