What 和that 在名词性从句中的用法区别What 和that 都可以引导名词性从句。

一．在引导名词性从句时，从属连词that一般要注意三个不（three nos）：1．不省略（no ellipsis）当从属连词that引导主语从句、表语从句和同位语从句时，that不省略。

Eg. 1) That he was able to come made us happy.(That 引导主语从句不可省略)2)The truth is that I didn’t go there. (that引导表语从句不可省略)3)The news that our team has won is true. (that引导同位语从句不可省略)但在非正式文体中that 引导宾语从句时可以省略，除下列两种情况外：that在宾语从句中不能省略的情况.(1). 在主+谓+it(形式宾语)+宾补+that，从句(真正宾语) 的句型中不省略.Eg: 4) He made it quite clear that he preferred to study English.（that不可以省略）他很明确地说他宁愿学习英语。

(2). 由连词and连接的两个由that引导的宾语从句中, 则第二个宾语从句前的that不省略。

Eg: 5) He told me (that) he would come and that he would come on time.（第一个That可以省略，但第二个that不可以省略。

)他告诉我他将来而且他将准时来。

2．不作成分（no component）that 在名词性从句中不作任何句子成分。

Eg. 6)Sydney kept his promise that he would always do anything he could for Lucie to make sure of her happiness.（that在句中引导同位语从句，但在句中不作任何成分）7))That you don’t like him is none of my business. (that在句中引导主语从句，但在句中不作任何成分，也不省略）3．没词义（no meaning）that 在名词性从句中没有汉语意思。

Eg. 8)That she is a rich woman is known to us. (that在句中引导主语从句，但在句中没有汉语意义) 她是一个很有钱的女子，这一点我们都知道。

9）The thought that he might fail in the exam worried him. (that在句中引导同位语从句，但在句中没有汉语意义）他也许会考试失败，这一想法使他很担心。

二．在引导名词性从句时，What一般要注意一个不（one no）,一个有（meaning）,一个作（component）：what不可引导同为语从句1．不省略what 引导名词性从句时，what 在句中不省略。

这一用法与that 用法不尽相同。

eg. 10) What I had for breakfast today was rice with egg.(what 在句中引导主语从句，what 不省略)11)----I think it’s going to be a big problem.----Yes , it could be .----I wonder what we can do about. (what在句中引导宾语从句，但在句中不省略）2．有词义what 引导名词性从句时，有词义。

一般是“----的东西/事情/话等”这一用法与that 用法不一样eg. 1) This is what she wanted to show us. (what在句中引导表语从句，在句中有词义，意思是“----的东西、事情）这是她想让我们看的东西。

12）What the teacher said had a good effect on the children. (what在句中引导主语从句，在句中有词义，意思是“----的话）老师所说的话对孩子们有很好的作用。

3．作成分what 在引导名词性从句时，在从句中充当成分。

这一用法与that 用法不一样。

Eg. 13)It does n’t matter what he said.( it 是形式主语，what 在句中引导主语从句。

What 在主语从句中作said 的宾语。

)14）It was true ______Alice did surprised her mother.A. that whatB. what thatC. that thatD. all what评析：这一题正确答案是A。

it在句中是形式主语，that引导的是主语从句that Alice did surprised her mother.，在这个主语从句当中，what 又引导了主语从句what Alice did，what在从句中作did 的宾语。

三．要特别提醒同学们的两点：1. What所引导的从句可以在介词后作宾语，而that从句一般不可以。

Eg：15）After months of voyage ,Columbus arrived in _____later proved to be a new continent.A. whereB. whichC. whatD. that评析：答案是C。

因为在介词in 后面，应该用what引导的宾语从句，what在宾语从句中作主语。

而that不可以这样用。

16) On stepping into his room, he was astonished to find the floor covered with _____lookedlike tiny insects.A. thatB. somethingC. whatD. anything评析：答案是C。

因为在介词with 后面，应该用what引导的宾语从句，what在宾语从句中作主语。

而that不可以这样用。

2.that可以引导定语从句，而且是定语从句引导词中的顶梁柱，它在定语从句中要充当成分，通常作定语从句中的主语、宾语。

同时that也可以引导名词性从句，在名词性从句中that 不充当成分。

但What不可以引导定语从句。

它只可以引导名词性从句,在句中相当于what =all that ,what 在名词性从句中充当成分，常常作主语、宾语和表语。

Eg: 17).All _____I want to know is what he meant .A.thatB. whichC. whatD. whatever评析：答案是A.本题是that引导的定语从句。

而what不可以引导定语从句。

What=allthat .又因为先行词是all ，故其后不可以接which 引导的定语从句。

而.Whatever=anything that /no matter what 从意义和语法都不符合。

所以只能选A,that.18) ______impressed me most was ______such a little boy could play the violin so well.A. That ; whatB. What ; thatC. That ; thatD. What ; what评析：答案是B.第一空是what 引导的主语从句，并在主语从句中作主语。

第二空是that 引导的表语从句，that在表语从句中不省略，不作成分，也没词义。

要真正掌握What 和that 在名词性从句中的用法，还得多多操练,熟能生巧（Practice makes perferct）。

练习：一．改错题：1.What we all like him is certain.2.He left is certain.３．I wished that we could go to Beijing this summer and we could buy some books on our way back4.His delay is due to the fact the car went wrong halfway.5.The idea which the world may be destroyed by nuclear weapons came to him.6.The news our team has won is true.7.He said that he had made a big mistake and he felt very sorry for it.8.The reason he did not come is he was ill.9.His delay is due to the fact the car went wrong halfway.10 .When you answer questions in a job interview ,please remember the golden rule: Always give the monkey exactly that he wants.Keys: 1.(what→That) 2.(he 前加that) 3.（在and 后加that）4.（在the car前加that）5.(which→that) 6.(在news 后加that ) 7.(第一个that可以省略，但第二个that不可以省略。

所以要在and 后加that) 8.（在is 后加that)）9.（在fact后加that）10. (将that 改what) 二）高考题：11．[92] It worried her a bit ______ her hair was turned grey.A. whileB. thatC. ifD. for12．[93] _____ he said at the meeting astonished everybody present.A. WhatB. ThatC. The factD. The matter13．[96] _____ we can’t get seems better than _____ we have.A. What / whatB. What / thatC. That / thatD. That / what14．[98] _____ caused the accident is still a complete mystery.A. WhatB. ThatC. HowD. Where15．[01] A computer can only do _____ you’ve instructed it to do.A. howB. afterC. whatD. whenKeys:11-15 BAAAC三）选择题：16．Air to us is ______water to fish.A. whatB. thatC. /D. like17．China is not _____ it used to be .A. thatB. whatC. whichD. /18. After ______seemed to be ten years later, he returned to his hometown.A. whatB. thatC. /D. which19.There are signs ______restaurants are becoming more popular with families.A. thatB. whichC. in whichD. whose20.It is pretty well understood ______controls the flow of carbon dioxide in and out the atmosphere today.A. thatB. when C . what D. how21.______fashion differs from country to country may reflect the culture differences from one aspect.A. WhatB. ThatC. ThisD. Which22.----What made her parents so angry ?----______ she had failed in the exam.A. AsB. BecauseC. SinceD. Thatrmation has been put forward ______more middle school graduates will be admitted into universities.A. whileB. thatC. whenD. as24.----Are you still thinking about yesterday’s game ?----Oh, that’s ______.A. what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited25.There is a new problem involved in the popularity of private cars _______ road conditionsneed _______.A. that , to be improvedB. which , to be improvedC. where, improvingD. when , improving26.Word has come ______some foreign guests will come to our school.A. thatB. whetherC. whichD. what27.No one can be sure ______in a million years.A. what man will look likeB. what will man look likeC. what look will like manD. what look will man like.28.____puzzled the police especially was ______the murderer died .A. The thing ; thatB. That ; howC. What ; howD. Which ; how29.Sometimes we are asked _____ the likely result of an action will be .A. that we thinkB. what we thinkC. what do you thinkD. if we think30. The fire destroyed all _____ was in the building .A. whatB. whichC. thatD. how31.It’s certain _____he will come to our rescue.A. whetherB. whatC. thatD. if32. I’m sure ______things will get better and ______we will get out of the trouble soon.A. that ; whichB. /;/C. /; thatD. that ; /33.He was so pleased with all ______we had done for him ______he wrote us a letter to praise usfor it . A. what ; what B. what ; that C. that ; what D. that ; that34.Was it in his office ______the manager made a promise ______he would give me promotion?A. when ; thatB. that ; thatC. when ; whichD. on which ; what35. There is no doubt _____ China will catch up with the developed countries.A. whichB. thatC. whetherD. what36._____he did well in the examination made him happy.A. WhatB. WhichC. ThatD. When37. There is a popular belief among the students _____one cannot hope to achieve success withouthard work. A. which B. that C. / D. what38.Who discovered the truth ______ the earth goes round the sun ?A. whichB. whatC. whenD. that39. By success I don’t mean ______usually thought of when that word is used.A. what isB. that weC. as youD. all is40. Although Anne is happy with her success she wonders ______will happen to her private life.A. thisB. itC. whatD. thatKeys:16-20 ABAAC 21-25 BDBAA 26-30 AACBC31-35CCDBB 36-40 CBDAC。