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例2 as可引导非限制性从句，常带有#39正如#39As we know， smoking is harmful to one#39s healthAs is known， smoking is harmful to one#39s health As是关系代词例1中的as作know的宾语例2中，它充当从句的。

1 wish ， would rather 后的宾语从句如 he wished he had never been involved in such affairs i would rather you could teach me again 2 as if， as though引导的从句如 the little boy knows so many things。

注if only和as ifas though也有相同用法 用在目的状语从句中 1在for fear that， in case， lest引导的从句中，若用虚拟语气时，从句谓语为should + 动词原形并且 should不能省略 egShe examined the door again for fear。

一as if 从句用陈述语气，我这里说的从句用陈述语气，是相对于虚拟语气而言的即你所表达的句子是真实的或极有可能发生或存在的事实时设想语境比方说你现在屋里看不到外面的情况，却听到了雨滴声，表达如下It sounds。

注if only和as ifas though也有相同用法目的状语从句 1在for fear that， in case， lest引导的从句中，若用虚拟语气时，从句谓语为should + do并且 should不能省略 She examined the door again for fear that a thief。