It 既是代词又是引词。作代词时,它可作人称代词、指示代词、非人称代词,用于前指、非确指或习语中。作引词时,它本身无实义,只起先行引导的作用。
可作形式主语(it is + adj. + for/of sb. to do sth.)或形式宾语(it + adj. + to do sth.),真实地主语或宾语是不定式、动名词或名词从句,它们则放在后面。It 也用于强调句结构。
如想强调某个词或部分,可用it is (was)+强调部分(主语、宾语或状语)+that(who)的强调结构。本章要求了解代词 it 和引词it 的各种用法,重点掌握it 用于前指或后指;引词it 用于强调结构。
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