语音的自然度在很大程度上取决于韵律特征如声调、句调、轻重音等，而普通话、粤语与英语在这些特征上形成了鲜明对比。该文以普通话为研究对象，采用声学分析比较了普通话母语被试以及母语分别为标准粤语和美式英语的2组普通话二语被试的基频特征。通过一组句类、目标字调、焦点位置受控的语句，考察了每组被试的句调、声调、焦点重音的基频编码方式以及三者间的交互作用。研究发现，2组二语被试的偏误特征有同有异，很大程度上可归因于语言负迁移效应，这为汉语的二语语音韵律教学提供了启示。
Natural speech strongly depends on the prosodic features such as tone, intonation and stress, which are very different in Mandarin, Cantonese and English. This study compares the fundamental frequency (f0) contours of Mandarin speech between native speakers and 2 groups of L2 learners who were native in HK Cantonese and American English. The f0 manifestations in tone, intonation and emphatic stress as well as their interactions are evaluated for a set of controlled sentences varying in sentence type, tone identity, and focus position. The results show that most L2 errors can be ascribed to negative transfers from the L1. The findings have pedagogical implications for learners with particular L1s to improve their L2 Mandarin prosody.
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