用替代词去替代名词性从句这一语法现象叫做分句性替代。常用so来替代肯定的陈述从句，用not来替代否定的陈述从句。

　　1、从句替代词so的用法

　　在动词believe, be afraid, expect, fear, hope, imagine, say, tell, think, suppose等后，可用替代词so。

　　-Are we late? -I’m afraid so. (so=that we are late)

　　-Your father and mine were friends when young.

　　-I have been told so.

　　2、从句替代词not的用法

　　①I think / believe / suppose / expect / hope / guess / am afraid + not

　　-Do you think he will come? -No, I think not.

　　-Is there going to be a meeting tonight?

　　-I suppose not.

　　②I don’t think / believe / suppose / expect / hope + so

　　-Does the bell ring in the kitchen?

　　-I don’t think so.