名词性从句专项复习
主语从句、表语从句、宾语从句、同位语从句，在整个句子中所起的作用，相当于一个名词因此，这四种从句通称为名词性从句。引导名词性从句的连接词可分为三类：连接
词that，
whether, if （不充当从句的任何成分）连接代词：what, whatever, who, whoever, whom, whose, which. 连接副词：when, where, how, why
名词性从句连接词的选用
(一) that 和 what的选用：
that 和 what都可引导所有的名词从句。但是，what除起连接作用外，还在名词性从句中充当成分，可做从句的主语、宾语、或表语。而that在名词性从句中不充当任何成分，只起连接作用。
that / what
1.______ he wants is a book.
2. ______he wants to go there is obvious.
3.The result is ______ we won the game.
4.This is _____ we want to know.
5.Is _____ he told us true ?
6.We should pay attention to ______ the teacher is saying.
7. I have no doubt _____ he will come.
8. I have no idea _____ he did that afternoon.
(二）if 和whether 的选用
不能使用if 的情况：
a. 主语从句b. 表语从句c. 同位语从句
d. 介词后的宾语从句e. whether to do 做动词宾语不能用if to do.
f .whether or not 连在一起引导宾语从句时不用if.
1. I asked her __________ she had a bike.
2.______we will hold a party in the open air tomorrow depends on the weather.
3. We’re worried about ________ he is safe.
4. I don’t know ___________ he is well or not.
5. I don’t know ________ or not he is well.
6. The question is _________ he should do it.
7.The doctor can hardly answer the question ______ the old man will recover soon.
8. I don’t know _______ to go.
（三）其它连接代词和副词的连用
主要根据名词性从句中的具体意义,正确的选择who、which、when、where、why、how 等连接词，这些连接词既具有疑问含义，又起连接作用，同时在从句中充当各种成分。我们何时举行运动会还没有决定。
________ we shall hold our sports meeting is not decided.
我不知道昨天谁打破了玻璃。
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