Question

何时选择that和wh-做名词性从句的引导词

说说区别就行，还要特例

Answer 1

名词性从句缺成分时多用what
不缺成分时用that
比如:I know that you are clever. 宾语从句you are clever.是一个完整的句子，所以引导词就用that
I don't know where you live. 从句里单独用you live是不完整的，缺地点状语，所以就要用连接副词where了
当然只是举了宾语从句的例子，主语从句，表语从句，同位语从句都属于名词性从句，情况类同。

追问

把表语从句和主语从句同位语从句都说下吧、、、求啊
说下就给你分

追答

呵，表语从句，同位语从句也一样啊。
比如：My answer is that I don't agree with you.表语从句，不缺成分
This is what I want.表语从句，缺宾语

The news that we won the match is true.同位语从句不缺成分
He must answer the question what his name is.同位语从句，缺表语

追问

那有没有什么特例呢？
我要写卷子，拜托啦~

追答

名词性从句里缺成分多用what,但也不能生拉硬套，还要根据句意。

在做题过程中，更重要的是你要首先会判断是否是名词性从句，然后再根据句意，不缺成分选that,缺什么成分，选相应的连接代词或连接副词。一定不要跟定语从句混淆在一起，那样就麻烦了，祝你进步！

Answer 2

that万能引导词，人物皆可which物 who人 whose所有格

Answer 3

名词性从句有主语从句、宾语从句、同位语从句、表语从句。
that/whether引导同位语从句，主句并不缺少成分，从句也不缺少成分（区别于定语从句），that在从句中不做任何成分，从句起到补充说明的作用。可以跟同位语从句的名词通常有news，idea，fact，promise，question，doubt，thought，hope，message，suggestion，words（消息），possibility等（一般的“抽象”名词都可用）。eg: heard the news that our team had won．/He must answer the question whether he agrees to it or not.
wh-引导主语从句、宾语从句、表语从句。主句缺少的成分用从句表示。eg：who is with long hair is David.(主语从句）we are looking at who is with long hair .(宾语从句)here is who is with long hair .(表语从句)