复合句的概念：由一个主句和一个或一个以上的从句构成。
宾语从句
一．概念：在句中起到宾语的作用。
二．宾语从句在句中的位置：
（1）作动词的宾语：
例：I heard that he joined the army. She did not know what had happened.
(2) 作形容词的宾语
例：I am afraid that I have made a mistake.
(3) 作介词的宾语
例：Our success depends on how well we can cooperate with one another.
