14.it的用法

14.it的用法

• 指前面已经提到的过的人或事， 作真实的主语

  • what a beautiful baby, is it your nephew?

• 用作非人称代词时，表时间，天气，温度等，没有真实的意义

  • what’s the weather like?
  • it is very cold

it作形式主语

• 不定式，动名词或名词从句作主语时，使句子的结构更加平稳，对称，用it作形式主语，后接不定式，动名词或名词从句作真正的主语
  • To lie in the sun is pleasant
  • It is pleasant to lie in the sun

it用在强调句中

• 用于强调某个词或短语，It is/was+被强调对象+that或whom从句
  • It was Freda who/that phoned Jack last night(是Freda昨晚给Jack打了电话)

it作形式宾语

• it+形容词 可用在find一类的动词之后作形式宾语或先行宾语，再接作真正宾语的动词不定式或that引导的从句
  • he find it difficult to concentrate

it用于一些搭配中

• it可以用在enjoy,like等动词后
  • I don’t like it when you shout at me

It seems that/is possible that从句

• it充当先行主语
  • it seems that he forgot the bag