复合从属连词as if主要用来引导从句(状语从句或表语从句),表示猜测、假定、联想、比较或行为的方式。一般来说,在及物动词和一般不及物动词后,as if引出方式或比较状语从句,在look,seem,appear,feel,sound等动词后引出表语从句。 The compound dependent conjunction as if is mainly used to guide clauses (adverbial clauses or predicative clauses) and to express the ways of guessing, hypothesis, association, comparison, or behavior. In general, after the transitive verbs and general intransitive verbs, as if the eliciting method or the comparative adverbial clause, after the verbs such as look, seem, appear, feel, and sound, the predicative clause is drawn.