1.作人称代词
John likes playing Pingpong./ He always does it in the afternoon.(指代上下文提到的事物);/
It\'s time we went home. / How far is it from here to your home ? / It is getting warmer and warmer./ It\'s very quiet at the moment.
(可指时间、天气、环境等)
2.引导词
A.作形式主语,代替由不定式、动名词或从句表示的真正主语。
It\'s important for us to learn a second language./ It\'s no use talking to him./ It\'s known to all that the earth goes round the sun.
John likes playing Pingpong./ He always does it in the afternoon.(指代上下文提到的事物);/
It\'s time we went home. / How far is it from here to your home ? / It is getting warmer and warmer./ It\'s very quiet at the moment.
(可指时间、天气、环境等)
2.引导词
A.作形式主语,代替由不定式、动名词或从句表示的真正主语。
It\'s important for us to learn a second language./ It\'s no use talking to him./ It\'s known to all that the earth goes round the sun.