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英语语法大全:it用法大集结

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发表于 2016-7-9 17:49:47 | 显示全部楼层 |阅读模式
  在学习代词it在句中作主语时,需要注意以下几点:
          一、 it作形式主语时,除了教科书上讲解的可代替不定式和主语从句外,还可代替动名词。例如:
          It's no use crying over spilt milk. 后悔无用。
          It's no good taking in much fat and sugar. 摄取大量的糖和脂肪没有好处。
          另外,学习代词it作形式主语时,还要注意学会使用下列常用句式。
          It takes / took / will take sb. some time to do sth. 做某事花费某人多长时间
          It looks / looked as if ... 看起来好像……
          It seems / seemed that ... 似乎……
          It (so) happened that ... 碰巧……
          It turns / turned out that... 原来是……
          It is said / reported / believed / hoped / well known / suggested ... that...
          据说 / 据报道 / 相信 / 希望 / 众所周知 / 建议……
          It occurred to sb. that ... 某人想起……
          It was / will be + 一段时间 + before ... 过 / 要过多久才……
          It is / was / has been / had been + 一段时间 + since ... 自从……已经……例如:
          It will take us a very long time to improve our reading.
          It looks as if it is going to rain.
          It seems that something unusual will happen to them.
          It (so) happened that I had no money with me.
          It turns out that he is a famous computer expert.
          It is said that they have got married.
          It is well known that the bird flu is a very serious disease.
          It is hoped that every one of us will protect wild animals.
          It occurred to me that I should have a talk with John.
          It will be a long time before we meet again.
          It is two years since he went abroad.
          二、非人称代词it,还可指代this,that。例如:
          -Do you know what this is in English? 你知道这个英语怎么说吗?
          -It's a cell phone. 这是手机。
          -How about that? 那个呢?
          -It's a computer. 那是电脑。
          三、指代有生命但不能或不必区分性别的人或物。例如:
          Yesterday we saw a big elephant in the zoo. It is about three meters high. 昨天我在动物园看到一头大象,大约三米高。(it指代elephant)
          Listen! The baby is crying out loud! It must be very hungry. 听!那婴儿在大声哭!一定是饿极了。(it指代baby)
          四、指代上下文中所提到的事物。例如:
          Unfortunately, I lost my favorite watch on my way to school. It cost me more than 200 yuan. 真不幸,上学路上把我最喜欢的手表给弄丢了。它花了我200多元。(it指代上文中的watch)
          On my mother's birthday I bought a present for her. It was an expensive necklace.母亲生日那天我给她买了礼物--一条昂贵的项链。(it指代上文中的present)
          Although we cannot see it, there is air all around us. 尽管我们看不到空气,但我们周围到处都是空气。(it指代下文中的air)
          五、指代上文中提到的事件。例如:
          Mr. Li has gone abroad for further study. Have you heard of it? 李老师已出国深造。你听说(这件事)了吗?
          I have told him many times not to be late for class, but it didn't help. 我已经告诉他好多次上课不要迟到了,但就是没有用。
          六、指代身份不明的人。例如:
          -Look! Something is coming. Who can it be?
          -It may be our director.
          -Who is it?
          -It's me.
         
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