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“是”，在先秦时期主要用作指示代词，用来复指前面的主语部分。在主语部分比较短的句子 中，“是”的复指作用开始虚化，而联系主语和谓语的作用却在增强。受形容词“是”的影响，复指代词“是’具有 了确认、肯定的意义，从而具备了形成判断词的两个内因。在否定副词“非”等多种外在因素的作用下，到了战 国后期，复指代词“是”转化成了判断词，纯粹的判断词“是”终于产生了。东汉时期，“是”字判断句已趋于成 熟。
“Yes”, mainly used as a demonstrative pronoun in the pre-Qin period, is used to refer to the subject part in front. In the short sentences of the subject part, the “double” effect of “yes” begins to faint, while the function of the contact subject and the predicate is enhanced. Affected by the adjective “yes”, the compound pronoun “yes” has the affirmatory and affirmative meaning and thus possesses the two internal causes of forming the judgment word. Under the action of the negative adverb “Fei” and other external factors, In the later period of the Warring States period, the compound pronoun “yes” was translated into a judgment word, and the pure judgment word “yes” finally came into being. In the Eastern Han Dynasty, the judgment sentence of “yes” became mature.