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知识点三：Grammar and Writing Devices
I. Grammar
Word Formation: negative prefixes
categories
(1) in-
(2) un-
(3) dis-
Examples:
1. There are persons who file paper and persons who unfile paper.
2. In the grandest offices, men approve of some paper and disapprove of other paper.
3. Nowadays, most fathers sit in glass buildings doing things that are absolutely incomprehensible to children.
Let’s do some exercises.
