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题目
什么情况下能用形式主语it呢

提问时间:2020-10-12

答案
不定式作真正主语
  主要用于下列句型:  1.It + is/was + adj./n.(形容词或名词) +to do sth. 名词从句作真正主语
  用it 作形式主语的结构主要用于下列句型:  It +谓语+名词从句(主语从句、表语从句、同位语从句)   1.It is +名词+从句:这样的名词有a fact,a surprise,an honor(非常荣幸),a pity,common knowledge(常识)等.例如:  It is common knowledge that the full moon brings fair weather.皓月兆天晴,这是常识.  It is a surprise that you gave such an answer to the question.你对这个问题作了这样的回答,令人吃惊.  2.It is +形容词+从句:这样的形容词有natural,true,strange,necessary,important,obvious(很明显),certain,wonderful,funny,possible,likely,probable等.例如:  It is certain that free medical care will be given to most people in our city.我们城市的多数人将享受免费医疗,这是一定的.  It is probable that he has known everything.很可能他什么都已经知道了.  3.It +动词+从句:这样的动词有seem,happen,appear,look,matter,make,strike,occur(突然想起)等.  It appeared that he had a taste for music.看来他对音乐有一定的鉴赏力.  It made us very happy that she was saved.她能化险为夷令我们大家很高兴.  4.It + be + 分词+从句:这样的分词有 said(据说),reported(据报道),believed(人们相信),known(众所周知),decided(已决定),proved(已证实),thought,expected,annouced,arranged,amusing,puzzling,striking等.例如:  It is said that Li Hao has been to Europe.据说李郝去过欧洲.  It was amusing that a rabbit ran out of the empty box on the desk.桌上的空盒子里竟然跑出来一只兔子,太有趣了.  需要说明的是,大部分连接词引导的主语从句都可以用 it充当形式主语.例如:  It remains unknown when they are going to get married.他们何时结婚依然不明.  It says in the newspaper that the enemy has been defeated.报纸上报导敌人被打败了.  形式主语:  It +be+(the)+adj.+for sb.+to do sth.
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