在全面描写常熟方言古见系声母今读情况的基础上，分析各母例外字的读音来源及形成原因，进一步归纳常熟方言见系声母的演变情况。其中，见组字存在两种不同性质的腭化形式，尽管都表现为文白异读，却代表着不同的历史层次；疑母字正处于ŋŋ̍/ȵ＞ɦ的演变阶段，甚至还有少数字声母进一步脱落变成零声母；匣母字的今读声母有两条演变轨迹：一是朝着腭化的方向演变，一是朝着零声母的方向发展。通过共时的描写和历史的比较，厘清常熟方言古见系声母的历史层次，为北部吴语的今读和演变情况提供翔实的方言依据。%This paper studies the present-day pronunciations of MC jian group of Changshu dialect, analyzes the probable origins of the exceptional words, and then induces their historical development. Some conclusions have been drawn in the paper. Firstly, there are two different forms in jian group, which represent different historical strata. Yi group is in the stage of ŋ ŋ̍/ȵ>ɦ, and some initials in this group turn to zero initial. Xia group has two ways to develop; one is read like jian group. The other also turns to zero initial. According to synchronic descrip⁃tion and historical comparison, this study can offer the fact to north Wu dialect.
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