⑴宾语从句可用that引导，这时that仅起连接作用，不充当从句中的成分。如果连接词要在从句中起语法作用，就要使用连接词what等来引导从句。

　　I believe that he is honest. We fully understood what he meant.

　　⑵有些形容词的后面也可跟宾语从句。这类形容词有：certain，afraid，aware，sorry，sure，worried等。如：

　　Im afraid that you are wrong on this point. I am aware that you have been exceptionally kind to me.

　　⑶宾语从句也可以用how，when，who，which，where，why等词引出，此时即使主句是一个疑问句，宾语从句也必须保持陈述句的语序。如：

　　Go and ask why he was late yesterday. Can you tell me where the hospital is?

　　⑷跟在介词后面的宾语从句一般不能由that来引出，只限于except，in，but，besides，save等五个介词的宾语从句，其它介词后面不能跟由that引出的宾语从句，而只能跟由what，how，whether等引出的宾语从句。

　　You are wrong in that you took effect for cause. I would go with you，except that I have to work that day. They were arguing about what was to be done. Im thinking of whom I should ask for help.

　　3. 表语从句表语从句通常由that引出，当然how，why，where，when等也可以引出表语从句。常见的表语从句有下面两种句型：

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