Someone is ringing the doorbell. Go and see who it is. It’s John on the phone. 2. 用作非人称代词,指时间、天气、距离或自
然现象等。如: It is only half an hour’s walk to the hospital.
It’s about two kilometers from here to the station. It is raining heavily outside. 二、it作引导词 1. it作形式主语的常用句型 ★ “It + be +名词+主语从句”中从句谓语常用“(should +)动词原形”。常用于本句型的主要有a pity, a shame, no wonder, no accident等。如: It is a great pity that he should be so greedy.
It is a shame that he should attempt to injure the reputation of an honest man.
It was no accident that such a book should appear in the 18th century. ★ “It + be +形容词+主语从句”中从句谓语常用“(should +)动词原形(或完成时)”。常用于本句型的形容词主要有impossible, strange,
surprising等。如: It is impossible that it should be a mere coincidence.
It’s strange that she should have been arrested for stealing.
It was surprising that he should have finished writing a novel in only twenty days.
★ “It +动词(+宾语或状语)+主语从句”。常用于本句型的动词主要有please, happen等。如: It pleased me very much that he succeeded.
It pleases me that he should want to talk with me.
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