It, One, That三词之用法区别三词之用法区别1. 它们三词均作代词用，指代前文提到的名词。但是it所指是同名同物，one和that所指是同名异物，如：我喜欢那辆汽车，可我没足够的钱买它。I like the car, but I have no enough money to buy it.我喜欢汽车，可我买不起一辆。I like cars, but I cant afford to buy one.我想买的那辆汽车要比他的那辆漂亮得多。The car which I want to buy is much more beautiful than that he has.2. It 可以替名词性从句、动名词和不定式短语，还可充当形式主语或宾语，而one和that无此用法。如：我发现按时完成这项工作是不可能的。哪里能找到足够的食物和水还是个问题。I find it impossible to complete the project on time.It is a question where we can find enough food and water.3. It 和that都可以指代上文的一部分或全句,而one不能。如如:杰克和我在美国一起学习了三年,我是不会忘记这事的.Jack and I studied together in the United States; Ill never forget it.It 可表示天气、时间、距离，以及现场情况知其为何事。如何做得更快更好?那确实是个问题.How to do it better and faster? That is really a question.4. one 和 that虽然都可以用来指代前文同名异物的名词,但one指代同类中的一个,属于泛指=a/an+N;而that属于特指=the+N. 如:Do you need my pen? No, thanks.I have got one (=a pen).The bridge built of steel is stronger than that built of stone.=the bridge5. One只能代替可数名词,复数用 ones,而that可数或不可数均可代,复数用those. 如:篮子里很多苹果,请把烂的拣出来.我们的规章制度和别的机关的大为不同.北京的天气比上海的冷得多.There are a lot of apples in the basket. Please pick out the rotten ones.Our rules are quite different from those of other organizations.The weather in Beijing is much colder than that in Shanghai.6. One 一般有前置或后置的修饰语,或没有; 而that只可有后置的修饰语.如: This bag is too small. Please give me a bigger one.This school is the one that we visited last week.The air in the countryside is fresher than that in cities.Make the best choice:1.Did you find your dictionary yesterday? No, I didnt find_, but Ive bought_. A. it/one B. one/one C. it/it D. one/itA2. The recorder is better than _I bought last year. A. the one B. one C. it D. whichA3. The population of Zibo is smaller than _ of Beijing. A. one B. that C. population D. thenB4. Would you like a cup of coffee? No, Ive just had_. A. it B. that C. one D. the oneC5. I have bought a new bike. My _ doesnt work. A. old that B. that old C. the old one D. old oneD6. Do you have my book, Mr Yang? Yes, I have _ right here. A. one B. this C. it D. that C7. Is_necessary that we clean the floor again? A. one B. that C. this D. itD8. These pictures are more beautiful than_on the wall.A. that B. those C. one D. onesB9. I was disappointed with the film. I had expressed_to be much better. A. that B. this C. one D. itD10. _is a fact that English is being accepted as an international language. A. There B. This C. That D. ItD11. I hope there are enough glasses for each guest to have_. A. it B. those C. them D. oneD12. Few pleasures can be equal to_of a cool drink on a hot day. A. some B. any C. that D. thoseC13. Why dont we takea little break? Didnt we just have _? A. it B. that C. one D. thisC14. Toms mother kept telling him that he should work harder, but _ didnt help. A. he B. which C. she D. itD15. There is a photo on the wall. _ a photo of lei Feng. A. It B. Its C. Its D. HesB16. Do you consider _ wise to tell him the truth? A. that B. this C. which D. itD17. I lost my pen. Im loking for _. A. one B. that C. it D. thisC18. I glanced my watch. _was earlier than I thought . A. There B. This C. That D. ItD19. _is important for us to learn foreign languages. A. This B. He C. It D. ThatC20. _ needs further discussion whether well build a library or not. A. We B. He C. It D. ThereC21. The Parkers bought a new house but _ will need a lot of work before they move in. A. they B. it C. one D. whichB22. People in the west make _ a rule to buy Christmaspresents for their relatives and friends. A. it B.that C. this D. asA23. It was she _ gave a sharp whistle, _ makes it possible for us to catch the thief. A. who/that B. that/that C. that/which D. who/itC24. Well go to the cinema tonight. We must book the tickets in advance. Whod like to do _? A. that B. it C. this D. oneB25. _ doesnt make any difference my being there. A. That B. Which C. He D. ItD26. I hate _ when people talk with their mouths full. A. it B. that C. these D. themA27. _ was December 26,1893_ Mao Zedong was born in a common village. A. The day/when B. It/that C. It/when D. That/on whichC28. Wasnt _ a shame that she could never have any real happiness. A. there B. this C. that D. itD29. It was _ discovered the secret first. A. I who B. me that C. myself that D. myself whoA30. The baby was crying. His mother found _ hardto make him laugh. A. her B. this C. that D. itD