高中英语 知识点大全77 It句型.doc

高中英语知识点大全（77）：it句型1、it句型：主语+动词+it+形容词或名词+不定式短语此句型中，it 作形式宾语，常用于句型中的动词有find,feel, think, consider, make等。einstein.who was a jew, found it impossible to continue living in germany.爱因斯坦是一个犹太人，他发现他不可能在德国继续生活下去了。i found it quite pleasant to work with him. 我发现和他一起工作很愉快。he feels it his duty to help others. 他感到帮助别人是他的责任。it is hoped that 人们希望 it said that 据说it is believed that 人们相信 it is reported that 据报道it is hoped that our team will win the game. 人们希望我们的队赢得比赛。it is said that the strange old man is a great artist. 据说那个怪老头是一位艺术大师。it is reported in the papers that the president of the u.s.a will arrive next monday.据报纸报道美国总统下星期一抵达。it is believed that before writing was developed, people in china used to keep records by putting a number of stones together. 人们认为，在出现书写以前，中国人常把石块放在一起来记事。2、it is/was + adj. + for/of sb.+ to do sth. 某人做某事是.该句的it 为形式主语，真正的主语是后面的不定式（短语），for/of sb.是不定式的逻辑主语。能用于该句型的形容词常有：（1）important/ unimportant/ necessary/ possible/ impossible/ hard/ difficult/ easy/ useful/ usual/ unusual等。这些形容词的后面常用for来表示不定式的逻辑主语。its important(for you)to learn english well.(你们)学好英语很重要。its not easy for them to finish the work within three hours.对他们来说3小时内完成这项工作很难。（2）right/ wrong/ clever/ foolish/ stupid/ nice/ kind/ rude/ polite/ impolite等。这些形容词的后面常用of 介词短语表示不定式的逻辑主语。its kind of you to help us.你们帮助我们真是太好了。its impolite of a person to interrupt people while they are talking.打断别人谈话的人是不礼貌的。3、it takes sb. some time to do sth. 做某事花某人时间。其中的it 是形式主语。代替后面的不定式（短语）。it will take us a whole week to travel through the forest. 穿过这片森林得用我们一整周时间。it took them 3 days to finish the work.干完这项工作用了他们3天时间。its time for sth . 该是做的时候 如：its time for lunch. 该吃午饭了。its time (for sb) to do sth . 如：its time (for us )to go to school. (我们)该上学了。也可用如下说法：the time has come for lunch.the time has come for us to go to school.注意：在its time 句式中time 前可加high, about 等修饰词，用法不变。其后跟that 从句时要