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1、what what 引导名词性引导名词性从句的五种用法从句的五种用法After_seemed a very long time,I opened my eyes and found myself in bed!A.what B.when C.that D.whichA I dont know what you mean.什么一、用法归纳一、用法归纳 1.表示表示“的东西或事情的东西或事情”“所所 的的”，相当于相当于“the thing that.;all that.;everything that.”Theyve done what they can do to help her.他们已经尽
2、力帮助了她。他们已经尽力帮助了她。He saves what he earns.他赚多少，积蓄多少。他赚多少，积蓄多少。What Mary is is the secretary.玛丽的职务是秘书。玛丽的职务是秘书。2.表示表示“的人或的样子的人或的样子”（指抽象意义的（指抽象意义的人）相当于人）相当于the person that（见（见66）：）：He is no longer what he was.他已经不是以前的那个样子。他已经不是以前的那个样子。He is what is generally called a traitor.他就是人们通常所说的叛徒。他就是人们通常所说的叛徒。Wh
3、o has made Fred he is now?what3.表示表示“的数量或数目的数量或数目”,相当于相当于the amount/number thatOur income now is double what it was ten years ago.我们现在的收入是我们现在的收入是10年前的两倍。年前的两倍。The number of the students in our school is ten times what it was before liberation.现在我校学生的数量是解放前的现在我校学生的数量是解放前的10倍。倍。4.表示表示“的时间的时间”,相当于相当于t
4、he time that：After what seemed like hours he came out with a bitter smile.似乎过了几个小时他才苦笑着出来。似乎过了几个小时他才苦笑着出来。The young girl was too frightened to speak,standing there for what seemed like hours.小女孩吓得不敢说话，在那儿站了几个小时。小女孩吓得不敢说话，在那儿站了几个小时。5.表示表示“的地方的地方”,相当于相当于the place thatThis is what they call Salt Lake C
5、ity.这就是他们称为盐湖城的地方。这就是他们称为盐湖城的地方。In 1492,Columbus reached is now called America.what归纳总结：当名词性从句缺少主语、宾语、归纳总结：当名词性从句缺少主语、宾语、表语，而缺少的这个词不是指具体的人时，表语，而缺少的这个词不是指具体的人时，要首先考虑要首先考虑what巩固练习巩固练习:1.She has changed a lot.Shes no longer _she used to be.A.that B.what C.which D.不填不填2.The tobacco which is used to make
6、 cigarettes was first grown in_is now part of the United States.A.which B.that C.all D.what3.No longer_Tom the man_he used to be.A.will;what B.was;what C.will;that D.is;that4.What has made China_she is today?A.that B.what C.as D.which5.The number of the students of the college has reached 8,000,twic
7、e _ it was when the college was opened ten years ago.A.what B.as much C.which D.that二、用法说明二、用法说明(1)这样用的这样用的what相当于相当于“先行词先行词+关系代词关系代词”，所以其前不能有先行词：，所以其前不能有先行词：你喜欢什么就拿什么吧。你喜欢什么就拿什么吧。正：正：You can have what you like./You can have everything(that)you like.误：误：You can have everything what you like.二、用法说明二、
8、用法说明(2)有时有时what 可用作限定词，其后修饰一个名可用作限定词，其后修饰一个名词词（见（见42）：）：I gave him what books I had.我把我所有的书都给他了。我把我所有的书都给他了。He gave me what money he had.他把身边带有的钱全给了我。他把身边带有的钱全给了我。(3)what 后的名词可以是复数名词或不可数名词，后的名词可以是复数名词或不可数名词，但通常不能是单数可数名词：但通常不能是单数可数名词：误：误：I gave him what book I had.A is to B what C is to D句型分析句型分析 句型句型:A is to B what C is to D.本句型的意思是本句型的意思是“A对对B而言正如而言正如C对对D一样一样”。其中。其中what 的意思相当于的意思相当于 as（但在此句型不能用（但在此句型不能用as代替）代替）,作连词作连词用用,引导状语从句。引导状语从句。Air is to us what water is to fish.空气对于我们犹如水对于鱼。空气对于我们犹如水对于鱼。其中介词其中介词to表示对比表示对比