本文嘗試從歷時角度探討「即」、「便」、「就」成為縱予連詞的發展過程，兼論三者成為假設和讓步連詞的演變。文中主張三詞的縱予、假設和讓步連詞功能都是從強調副詞語法化而成，將分別根據各詞的演變實況提出多項證據作為支持。文章最後列舉其他語言以及漢語中若干平行的語法化演變，並探討引發此項演變的條件及機制。

This paper explores the formation of the concessive conditional conjunctions ji, bian and jiu as well as that of their functions as conditional and concessive conjunctions. Based on the historical developments of the three words, this paper argues that all the three conjunctive functions of the three words were grammaticalized from the emphatic adverbs. This paper also discusses the parallel grammaticalization in other languages and the conditions and mechanisms for the grammaticalization in Chinese.