it的用法总结

it的用法总结和练习①It is never too old to learn. 活到老，学到老。

②It is easier said than done. 说起来容易做起来难。

③It is no use crying over spilt milk. 覆水难收。

④It never rains but it pours. 不鸣则已一鸣惊人。

一、it的常用固定词组二、it 做代词的用法1.Tom has failed in the exam. Have you heard about it?代替前文提到的东西或事情。

2.Tom bought a new house, but it needed lots of work before he moved in. 代替同名同物。

3.Whose room is this? It is theirs.代替指示代词this,that的作用。

4.Let’s go to see who it is. 指明某人某事的身份或不知男女用it。

5.It’s Sunday today.（date）It is very cold today. （weather）It is about 8:30 now. （time）It’s 5 yuan. （value）It lies in the south of Shaoguan city. （place）It is 5 kilometers from A to B. （distance）三、it做形式主语的用法1.It+ be+ adj+ of/for+ sb +to do sth（用of的形容词bad / brave / careless / clever / cruel / foolish / good（好心的）/ honest / horrible / kind / lazy / modest / naughty / nice（有教养的）/ polite / rude / silly / stupid / wise / wrong（错误的））2.It+ be+ adj +that/whether +从句（true /easy /hard /necessary /curious / obvious /likely /possible /probable /good /wonderful /natural /certain / natural / strange / normal / unusual/ impossible / pleasant / important）3.It+ be+ pp（said /reported /believed /supposed/ expected /proved / hoped / thought / known / decided / advised / ordered / demanded ）+that+ 从句4.it is/was a pity that …it is/was no wonder that …it is/was a shame that …it is/was no surprise that …it is/was an honor that …it is/was a good thing that …it is/was a fact that …5. It seems/seemed that/as if …It happens/happened that/as if …It appears/appeared that/as if …6.It hits/hit sb that …It strikes/ struck sb that …It occurs to sb that …It occurred to sb that …7.It is/was no use doing sth It is/was no good doing sthIt is/was useless doing sth四、it作形式宾语的用法1.Sb +动词+ it +if/ when 引导的宾语从句（like / dislike / hate / enjoy / love / appreciate）2. 6123结构think / make / find / consider / feel/ believe3.I take it that you will be leaving for Shanghai soon.认为The rumor has it that the mayor will resign to take the responsibility for the crisis. 据传You can count on it that he will arrive on time. 期待She will see to it that he goes ahead. 确保You can depend on it that the result will be announced.五、常用句式。

1.强调句型基本结构It is/was + 被强调部分+ that(who)+其他部分一般问句Is/Was it + 被强调部分+ that+其他部分？特殊问句特殊疑问词+is/was + it + that +其他部分？2.It takes/ took / will take sb some time to do sth3.It is time/ about time/ high time that …It is time for sb to do sth ; It is time for sth / to do sth4.It is adj of sb to do sth; It is adj for sb to do sthIt is up to sb to do sth5.It is one’s duty/ turn to do sth6.It is no use/ no good / useless doing sth7.It is a waste of time doing sth8.It is convenient for sb to do sth9.It is likely that 从句10.When it comes to doing sth/sth11.It is no wonder that 从句12.It/This/ That is the best/worst/most interesting + n + that 从句从句时态用现在完成时13.It/This/That is/was the 序数词time that 从句时态用现在完成时/过去完成时14.It will be +一段时间+before + 从句表示再过多久才……It won’t be +一段时间+ before + 从句表示用不了多久就……It was + 一段时间+ before +从句表示过了……才……It wasn’t + 一段时间+ before + 从句表示没过……就……15.It is/has been +一段时间+ since +从句16. It is/ was not until +被强调部分+ that +剩余部分17. It is/ was +时间+when 定语从句18. It is great fun doing sth.It is worthwhile doing/to do sth.六、翻译练习1.要花多年的时间才能掌握一门新的语言。

2.我写这封信花了一个小时。

（it takes sb some time to do sth）3.他说那样的话，真是太傻了。

（it is foolish of sb to do sth）4.爬山是费劲的事。

（it is hard work doing sth）5.这里的夏天有时会很热。

（it can be）6.有人在敲门。

一定是邮递员。

（there be; a knock on the door; postman）7.得由你来做出选择。

（it is up to sb to do sth）8.他打电话时我碰巧不在家。

（it happens that）9.If it were not for their timely help, I couldn’t have got over the difficulties.10.我们认为抱怨是没有用了。

（think it no use doing; complain）七、练习题1.I still remember the accident and the troubles ____ has caused to me.2. ___ is certain that she will do well in her exam.3. It is a pity ____ I can’t go with you.4.___ now appears that they are in need of help.5.___ hits me that I should turn to my teacher for help.6.___ suddenly occurred to him that he had left his keys in the office.7.I like ___ in the fall when the weather is clear.8.I consider ___ a great honor to be invited to your party.9.He has made ___ clear that he won’t give up.10. It is the most instructive lecture that I ________(attend) since I came to this school.11.___ is two hours before the medicine takes effect.12.It was about 600 years ago _____ the first clock with a face and an hour hand was made.13.___ is 3 days since I fell ill.14.How long do you suppose ___ is since he got the news?15.___ was yesterday that I met Tom in the park.16.Was ____ yesterday that you met Tom in the park?17.When was ___ that you met Tom in the park?18.My teacher didn’t know when ___ was that I met Tom in the park.19.___ is that he often fails in exams that makes his parents worried about him.20.___ was the news that he has succeeded that inspired them all.21.Is ____ the school where you once studied that will be rebuilt with the help of the Project Hope?22.It was not until I failed in the exam ____ I realized that I should work hard.23.It was in the library ____ we often learned by ourselves thatI met her for the first time.24.It was ____ 6 o’clock that I got home yesterday.25.It was 6 o’clock _____ I got home yesterday.26.___ is of no importance to do such a thing.27.It is time that we _________(go) to school.28.___ is well known to us all that the earth is round.29.____ is well known to us all, the earth is round.30.I don’t think ___ possible to master a foreign language without much memory work.31.Does ___ matter if he can’t finish the job on time?32.____ is no need for you to wait here.33.Was it the house _____ Abraham Lincoln was born?34.Was is in the house ______ Abraham Lincoln was born?35.Many people now make ____ a rule to buy cards for their friends before Christmas.八、改错1.The climate of South China is mild. I like one very much.2.The climate of South China is much better than it of Japan.3.That remains to be seen whether it will do us harm or good.4.This was not until his mother came back that he went to bed.5.It is difficult of them to settle the problem.6.He didn’t make clear when and where the meeting would be held.7.That is our belief that improvements in health care will lead toa stronger, more prosperous economy.8.I’d appreciate if you would like to teach me how to use the computer.9.The doctor advised Vera strongly that she should take a holiday, but which didn’t help.10.It was along the Missippi River where Mark Twain spent much of his childhood.11.You won’t find difficult to get to the city center.12.I know there is not easy to be a teacher.13.Don’t take it granted that others should help you.14.This is not surprising that the Silver Ghost was regarded as “the best car in the world”.15.It believed that the harder you work, the better result you’ll get.16.Does that matter a lot whether she will come here by bus orby taxi?17.The TV sets made in China are much better than it in Japan.18.—I’m looking for a flat.--Would you like it with a garden?19.—Have you written a letter to her?--No, but I’m going to write it tonight.20.Our food and service are better than it used to be.21.It was in Beihai Park that they met for the first time that the old couple told us their love story.22.She looks sad. Could you please tell me what this is that prevents her from being as happy as before?23.It was until mother came back that I went to bed.24.It was her that won the championship this time.25.It is I who is wrong.26.It is Mary who often help me with my English.27.Is it the dictionary that you are looking?28.It will be three years since we get together again.29.It is ten years before Miss Gao returned to China.30.It was not until 1920 when regular radio broadcasts began.答案：六、1.It takes years to master a new language.2.It took me an hour to write the letter./ The letter took me an hour to write.3.It was foolish of him to say such a thing.4.It is hard work climbing mountains.5.It can be really hot here in summer.6.There is a knock on the door. It must be a postman.7.It is up to you to make a choice.8.It happened that I wasn’t at home when he called.9.如果没有他们及时的帮助，我不可能克服这些困难的。