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1、What引导名词性从句的用法一.引导主语从句1)What we need is more time.(what做need的宾语)我们所需要的是更多的时间.2)What really matters is that she wore a pair of whiteshoes.(what做matters的主语)真正麻烦的是她穿了一双白鞋.二.引导宾语从句1)People were perhaps more honest a long time ago when life was very different from what it is today.(what做从句中is的表语)很久以前当生活与
2、现在的生活完全不同时，人们或许更诚实.2)People have heard what the President has said;they are waiting to see what he will do.(what分别做动词heard和see的宾语)人们已经听到了总统所说的；他们正等着看总统会做什么.三.引导表语从句1)Whether ways will be found to stop pollution or not is just what worries the public.(what做从句中的主语)是否能找到阻止污染的方法就是所令民众担心的事儿.2)That is wha
3、t I want to tell you.(what做从句中的宾语)那就是我想告诉你的事儿.3)The little girl is no longer what she used to be.(what做从句中的表语)这个小女孩不再是过去的样子了.四.引导同位语从句1)They have no idea at all what he is working on.(what做从句的宾语)他们一点儿都不知道他正在做什么.2)You have no idea what I suffered.(what做从句的宾语)你不知道我所遭受的痛苦.通过以上例句及解释我们可以得出：what常用来引导名词性从句
4、，即主语从句，宾语从句，表语从句和同位语从句.what在引导名词性从句时有两个重要的特点：一是它在相应的名词性从句中一定有含义，常表示“什么”，“所的”，“的样子”等.二是它在相应的名词性从句中一定做成分，而且常做主语，宾语或表语.练习：1.It is not yet pretty well understood_made the rainforest disappear year by year.A.that B.when C.what D.how2.The word media basically refers to_we commonly call newspapers，magazine
5、s，radios and televisions.A.which B.what C.why D.how3.Its well understood _controls the flow of carbon dioxide in and out of the atmosphere today.A.that B.what C.how D.whether4.The small mountain village_we spent our holiday last month lies in_is now part of Hubei.A.which;where B.where;what C.that;which D.when;which5.The reason why he was late was_he had taken a wrong bus.A.because B.whether C.what D.that答案：CB B BD