高考英语复习之it的用法及改错中出现的It课件(共40张PPT)

it的用法、常用句型及高考改错之十大典型知识梳理it可以作代词（如人称代词、非人称代词）和引导词，也可以用于强调句式中，还可以用于一些固定表达中。一、it作代词1.用作人称代词，指代：①上文提到过的人、事、物或情况等；②婴儿、性别不明或没必要区分性别的人或动物。此外，it也可指代未知的人。如：In my opinion, life in the twenty-first century is much easier thanitwas used to.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：Itis only half an hour’s walk to the hospital.It’s about two kilometers from here to the station.Itis 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apity, a shame, no wonder, no accident等。如：Itis a great pity that he should be so greedy.Itis a shame that he should attempt to injure the reputation of an honest man.Itwas 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：Itis impossible that it should be a mere coincidence.It’s strange that she should have been arrested for stealing.Itwas surprising