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? -Im 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 dont think / believe / suppose / expect / hope + so
-Does the bell ring in the kitchen?
-I dont think so.
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