It的用法讲与练 学案--高考英语一轮复习.docx

It的用法 一、人称代词1，it的最基本用法是作代词，主要指刚提到的事物，以避免重复: ①They watched the train until it disappeared in the distance.2.，也可以指动物或婴儿(未知性别的婴儿或孩子):? ②Is this your dog？No, it isn’t. ③They got a baby and it was a ten-pounder3.，也可指抽象事物或指抽象环境和情景: ③I hate it when people talk with a full mouth.．二、.非人称代词1.it有时并不指具体的东西而泛指天气、时间、日期、距离、价值、度量、温度、环境等： ⑴.指天气：It is a lovely day, isn’t? it? ?? ⑵.指时间: It was nearly midnight when she came back. ⑶.指日期:It is April First today.? ⑷.指距离:It is some 3000 kilometers from A to B. ⑸.指价值:It is three dollars.????? ⑹.指温度:Today it is 30 degrees centigrade. 作形式主语，替代主语从句，动词不定式，或动名词短语：　　　1.作形式主语替代主语从句⑴It is clear ( obvious， true， possible， certain....) that ①It is very clear that he’s round and tall like a tree. ②It is certain that every effect must have a cause. ? ⑵It is important ( necessary， right， strange， natural...) that 从句 ? ①It is important that we (should) learn English well. ②It is necessary that he (should) remember these words. ⑶ It is said (reported/ learned/believed/consider/thought/known/told/hoped.....) that 从句 ①It is said that he has come to Beijing. ②It is reported that another earth satellite has been put into orbit. ⑷ It is suggested ( advised/ ordered / demanded/ insisted/ commanded/recommend/acknowledged... ) that ?①It is strongly suggested that the meeting ( should ) be put off. 　 ?? ②It is widely acknowledged that students are under great pressure . ⑸ It is time ( about time ，high time ) that从句(动词用过去时did/should do) ?? It is time that children went to bed. ⑹ It is the first ( second ... ) time that从句(从句用现在完成时 have done ) ? It was …(从句用过去完成时had done ).常译为＂是第一（二）．．．次．．．＂。 ①It is the first time I have been here. ②It was the first time that I had participated in the exchange student program,which not only broaden my horizon but also improved my confidence. ⑺ It is a pity ( a shame /an honour/a good thing/a fact,/a surprise/no wonder... ) that从句.? ? ①It is a pity that he is ill. ②It is no wonder that?youre tired,?youve bee