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1、It构成的句型小结 一、 It作形式主语的句型为使句子平衡，往往把it置于句首作形式主语，而把真正的主语（通常是不定式短语、动名词短语或主语从句）移至句末。It 作形式主语的句型有： it 代指不定式短语的句型1. It takes + (sb.) + sometime / some money + to do sth. 做某事花去某人多长时间Just a minute, it wont take me long to change.等一下,我很快就可以换好衣服。It takes five minutes to walk there.走到那里需要5分钟。It took me more than
2、 a year to learn to draw a beautiful horse in five minutes.我花了一年多时间才学会在5分钟内画出一匹好看的马来。It takes a lot of money to buy a house like that.买那样一幢房子需要很多钱。2. It takes + 名词 + (for sb.) to do sth. 某人做某事需要 It took great imagination as well as patience for Annie to teach me to speak.对安妮来说，教我说话需要极大的信心和想象力。It tak
3、es time for them to prepare for the great changes that take place in space.他们需要很多时间准备应付太空中所发生的巨大变化。3. It is + 形容词 + (for / of sb.) to do sth. 某人做某事是 的常用于该句型的形容词比较多。for sb. 的句型 常用于表示事物的特征特点，表示客观形式的形容词，如easy, difficult, hard, important, possible, impossible, comfortable, necessary, better等。of sb的句型一般用
4、表示人物的性格，品德，表示主观感情或态度的形容词，如kind, nice, stupid, rude, clever, foolish, thoughtful, thoughtless, brave, considerate(考虑周到的), silly, selfish(自私的) 等。It was not right for the south to break away from the union.南方脱离联邦是不对的。It was kind of you to help us.谢谢你对我们的帮助。It is getting harder every day for a lazy man
5、to get a living.懒汉谋生是越来越困难了。What time would it be most convenient for me to call again?什么时候我再给你打电话最合适？Its very good of you to have listened to me.感谢你能听我讲。Its very thoughtful and kind of you to offer me this lovely holiday.你能给我这么美好的假日，实在是想得太周到、太友善了。4. It is + 名词 + to do sth. 做某事是 的 常用于该句型的名词有：manners
6、, duty, fun, good, a great honour, the first, the next, the last, the best, too much, too little, not enough等。As a student, it is bad manners to come late to class.作为学生，上课迟到是没有礼貌的。It is our duty to pay taxes to our government.向政府交税是我们的义务。5. It is + ones turn + to do sth. 轮到某人做某事 It was my turn to cl
7、ean the blackboard.轮到我擦黑板了。6. It is + up to sb. + to do sth. 做某事是某人的责任或义务Its up to us to give them all the help we can.我们理应竭尽所能地给予他们帮助。 it 代指动名词短语的句型7. It is + 名词 + doing sth. 做某事是 用于该句型的名词有：no good, no use, hard work, a nuisance, a waste of time, a great honour等。Its no use talking to him about it.和
8、他谈论此事是没用的。Its no use/good (in) crying over spilt/spilled milk.事已至此，后悔也无用。（牛奶已泼，哭也没用。）It is hard work keeping the grass green at this time of year.这个季节还使草保持绿色真是不容易。It was a nuisance having to wait for such a long time.要等这样久真烦人。Its a waste of time your talking to him.你和他谈话是浪费时间。It has been a great hon
9、our your coming to visit me.你的来访是我很大的荣幸。8. It is + 形容词 + doing sth. 做某事真 用于该句型的形容词有：pleasant, useless, senseless, worthwhile, dangerous等。It was pleasant meeting you in London that day.那天在伦敦见到你真高兴。Its dangerous playing with fire.玩火是危险的。Is it worthwhile making such an experiment?做这样的实验值得吗？ it 代指名词性从句的
10、句型9. It + be + 名词 + that从句用于该句型中的名词有：a pity, a shame, a fact, an honour, a wonder, a good thing, good news, no wonder等。惯用句型有：It is common knowledge that 是常识It is a surprise that 令人惊奇的是It is a fact that 事实是It is a pity that she has made such a mistake.真遗憾，她犯了这样一个错误。Its a pity that you should have to
11、leave.你非走不可真是件憾事。It is a thousand pity/ thousand pities that he missed the chance.他错过了这次机会真是太可惜了。It is no wonder that he has passed the examination.难怪他考试及格了。It is a shame that you have to leave so soon.你必须这么早离开，真遗憾。It was a stupid thing that he didnt listen to his teacher.他不听老师的话，真蠢。It is a great ho
12、nour that he receive that prize.他得到了那个奖真是无上的荣耀。10. It + be + 形容词 + that从句 是 用于该句型中的形容词有：clear, obvious, true, certain, important, strange, natural, surprising, fortunate, good, wonderful, funny, possible, impossible, likely, unlikely, quite clear, unusual等。惯用句型有：It is necessary that 有必要It is importa
13、nt that 重要的是It is obvious that 很明显It is important that we (should) learn English well.我们学好英语是非常重要的。It is necessary that the students (should) remember all the new words.学生记住所有的新单词是必要的。11. It + be + -ed 分词 + that从句 据 是 的常见的过去分词有：said, reported, learned, announced, known, decided, expected, believed,
14、considered, declared, felt, hoped, seen, supposed, thought, understood等。惯用句型有：It is said that 据说It is reported that 据报道 It is believed that大家相信It is hoped that大家希望It is well known that 众所周知It is thought that大家认为It is suggested that据建议It has been decided that 大家决定 It must be remembered that务必记住的是It i
15、s reported that another man-made satellite has been put into orbit.据报道，又有一颗人造卫星被送入轨道。It is said that he has gone to the USA for further study.据说他已去美国深造了。It is known to all that light travels in straight lines.众所周知，光以直线运行。It has been decided that we should design the machine ourselves.已经决定我们自己来设计这部机器。12. It + 及物动词 + 名词 + 从句It makes no difference to me whether its foggy or clear.对我来说，天气有雾或晴朗没什么关系。It doesnt
