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1·English finite and nonfinite are a binary opposition used to describe the features of verbs.

英语限定性与非限定性是描写动词特征的一组对立的属性。

2·PRO occurs in the subject position of infinitive clauses. Therefore, whether there is finite and nonfinite distinction in Chinese is the key issue concerning the existence of PRO in Mandarin Chinese.

由于PRO出现在非限定句的主语位置，因此汉语中是否存在定式与不定式的区别，是判定汉语中有无PRO存在的关键。