如何学好宾语从句？
一、宾语从句的概念与位置：
所谓宾语从句是指在复合句中充当宾语的句子，宾语从句紧随在主句动词、介词、间接宾语或形容词之后。
1）动词之后：He says that he can’t come tomorrow.
2)介词之后：She isn’t interested in what he is doing.
3）间接宾语之后:Can you tell me who he is?
4）形容词之后:I’m afraid he is ill.
二、宾语从句的连词
1）宾语从句为陈述句。由that引导，这时that没有词义，只起引导作用，不充当句子成分，在口语或非正式文体中常常省略。
eg. She says (that) she wants to go home now.
I don’t know(that) he is American.
2）宾语从句为一般疑问句时，由连词if或whether引导
eg .Do you know if/whether he has been to Japan?
He asked if/whether I could help him.
3）宾语从句为特殊疑问句时，由连接代词或连接副词引导，这时连词有词义，且在宾语从句中充当句子成分，常见的连接代词有：what, who, whom, whose, which;连接副词有:when, where, how, why, how many, how much, how old, how long etc.
eg. Can you tell us what they are doing?（在宾语从句中作宾语）
We don’t know whose pencil this is.（whose在宾语从句中作pencil的定语并与pencil一起作表语）
She asked who was the tallest in our class.（作主语）
We don’t know when the train arrives.（作时间状语）
Please tell me how I can get to the post office. （作方式状语）
Do you know how old she is?（作表语)