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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. | 
