有將近2.24億的人口以孟加拉語(Bengali)為母語或第二語言，是世界第六大語言(Comrie, 2005; Katzner, 2002; Weber, 1997)。儘管過去已有研究聚焦在孟加拉兒童的音韻能力，就我所知，本論文是指出兩歲孟加拉幼兒音韻偏誤類型的第一個研究。根據蒐集的資料，值得注意的語言產出特徵在輔音方面包括：不送氣化、去塞擦音化、省略（計有流音、/h/、其他韻尾及弱音節省略）、鼻音同化和雙子音化；在元音方面包括：相同元音合併、ɔ > o及補償性延長。除了語料呈現，本論文也針對這些偏誤類型提出可能的解釋。儘管研究結果令人振奮，我們還需再做多位受試者的長期研究，檢視性別及橫斷設計對標準孟加拉語的兒童語言習得有否顯著影響，又本研究發現的偏誤類型是否出現在其他孟加拉語方言，也值得進一步探討。

Bengali is the top 6th language in the world with nearly 224 million first and second language speakers (Comrie, 2005; Katzner, 2002; Weber, 1997). Even though some studies have focused on phonological skills of Bengali-speaking children, to the best of my knowledge, this thesis is the first study identifying error patterns in the speech of a two-year-old Bengali-speaking child. The notable benchmarks and features of language production based on the collected data include the following: de-aspiration, de-affrication, deletion (inclusive of liquid deletion, /h/ deletion, other coda deletion, and weak syllable deletion), nasal assimilation, and gemination on the one hand, and identical vowel merger, ɔ > o, and compensatory lengthening on the other hand. In addition to data presentation, this thesis provides possible explanations for the error patterns. While the results are encouraging, a longitudinal multi-subject study is necessary to examine whether gender and cross-sectional design exert a significant influence on Standard Bengali child language acquisition. Besides, error patterns found in the current study await future investigations on other Bengali dialects.

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