This paper suggests that the negative proposition, as a unique form of thinking, has its important logical function and cognitive value.
本文认为否定命题作为一种独特的思维形式，有着重要的逻辑功能和认识价值。
Negative sentences in Chinese are corresponding to two kinds of different propositions in logic. They are categorical negative proposition and the negative proposition of compound proposition.
汉语的否定句对应于逻辑上直言否定命题和复合命题中的负命题两种不同类型的命题。
The essence of negative sentence pattern to express affirmative proposition is to link two negative forms together for a positive sense.
汉语表达肯定命题的否定句式的实质是连用两次否定形式并表达一个肯定意义。
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