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“一旦”的共时性质与使用特点 = On Synchronic Natures and Use Features of “Yidan” / Zhang Xue-ping; Institute of Language Science and Language Planning,Henan University // 漢語學習 = Chinese Language Learning (Hanyu Xuexi) 2015, No.2.
2015.
p. 81-88.

Yidan is a word that has several functions in modern Chinese.In fact,yidan" mainly used a conjunction,sometimes used as a adverb,occasionally used as a atypical noun.It is uaually used as a time adverb in realistic context and irrealistic object clause before predicate,and its use is modification.It is used as a hypothetical or sufficient condition conjunction in the hypothetical conditional clause before predicate or subject,and its semantic is equivalent to "ruguo" or "zhiyao".Sometimes it has natures of adverb,conjuction and noun in the same context.The replacement between "yidan" that used as a conjunction and "ruguo" or "zhiyao" that needs some semantic and pragmatic conditions." Yidan" only expresses a possible hypothetical conditional relationship.