语法知识
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表语从句
用作表语的从句称为表语从句(PredicativeClause)。引导表语从句的关联词有连接代词who,whom, whose, which, what; 连接副词when,where, why, how和从属连词that,whether。从属连词if一般不用来引导表语从句,但as if(though) 却可以引导表语从句。在此类从句中,动词一般用虚拟语气。如: Helooked as though he were from the country. 当主句谓语动词为look, smell, seem, taste 等词时,从句谓语常用陈述语气。如:Thismeat tastes as if it has already gone bad. 又如:Themilk smells as if it is sour.

