关于英语中疑问代词在句中引导从句的用法

Question

具体点 怎么用 还是不懂

Answer 1

特殊疑问句中的疑问词在引导从句时叫作连接代词,可以引导名词性从句,即,主语从句,宾语从句,表语从句和同位语从句,如
I don't know what he did yesterday.
What he said surprised us .
The problem is where we can get so much money.
I have no idea when we will have a sports meeting.

Answer 2

在从句中，那不叫疑问代词，叫连接代词（连接副词）。由连接词引导的句子就叫从句，在有些时候连接词可省略。连接词有what,where,who,whose,whom,which,how,that,unless,if,before,since,because,so,until,once,whether等很多。用哪个连接词引导从句要看他是什么从句，从句意思和从句中所缺的成分而定。 如在Could you tell me what you are doing?中，主句中tell需要双宾语，tell sb.sth.所以主句缺少宾语。后面是它的宾语从句。在从句中，doing缺少宾语，what就可在宾语从句中作宾语，指人或物（在名词性从句中指“那一个时用which，指”谁”时用who，其他指人或物/事时都用what）本回答被提问者采纳

Answer 3

你所谓的“疑问代词”可以引导名词性从句和定语从句，而且在从句中做主、宾、表等主要成分。
Could you tell me what you are doing?
This is the book which I bought testerday.