Dòng Nội dung
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目的小句主语的隐现及其制约因素 = Covert and Overt Subjects of Purpose Clauses and the Restrictive Factors”. / Ding Jian. // 漢語學習 = Chinese Language Learning (Hanyu Xuexi) 2014, No.3.
2014.
p. 65-71.

In Mandarin Chinese,the presence or absence of the subjects of purpose clauses is basically the result of the joint influence of pragmatics and syntax. Normally,the subjects are optional; but sometimes they are compulsorily omitted. The optionality is related to the cooperative principle based on context. The compulsory omission is the result of the persistence of syntactic features in grammaticalization.