本論文探討新加坡口語英語（Singapore Colloquial English, SCE）的音段變化現象。新加坡口語英語是由英式英語（British English, BE）發展而成的一種英語變體。透過描述性資料與優選理論（Optimality Theory, OT）的分析，本論文檢視英式英語的音位及音叢在新加坡口語英語中的調整方式。在子音方面，齒擦音 /θ, ð/ 在新加坡口語英語中並不存在，其在音節首的位置被塞音取代，而在音節尾部則改為唇齒擦音。齒齦塞音/t, d/雖在音節首位置維持原狀，但在音節尾則實現為喉塞音[ʔ]。在母音方面，新加坡口語英語出現多種系統性變化，包括緊鬆元音的替換（如/ɪ/被調整為[i]），以及雙元音/eɪ/與/əʊ/的單元音化等。上述適應現象皆可透過優選理論框架加以解釋。其中，忠實性制約（如 Max-C、Max-V、Ident[voice]）與標記性制約（如*θ、*ð、*CorOralCoda等）相互作用。透過制約排序，能有效解釋所觀察到的音韻調整。在眾多音段變化中，擦音塞化與喉塞音化等現象廣泛存在於東南亞多種英語變體（如馬來西亞英語與菲律賓英語）。

This thesis investigates the segmental changes in Singapore Colloquial English (SCE). SCE is a variety developed from British English (BE) Drawing on descriptive data and Optimality Theory (OT) analysis, the thesis investigates how phonemes and clusters are adapted from BE. In terms of consonants, for example, dental fricatives /θ, ð/ are absent in SCE. In onset position, they are replaced by [t] and [d], whereas in coda position they surface as [f] and [v]. Alveolar stops /t, d/ retain their onset realization but are glottalized to [ʔ] in coda. In terms of vowels, for example, SCE displays tense-lax alternations, such as the replacement of /ɪ/ by [i], and monophthongization of diphthongs /eɪ/ and /əʊ/. These adaptations are analyzed within an OT framework, where faithfulness constraints such as Max-C, Max-V, and Ident[voice] interact with markedness constraints like *θ, *ð, and *CorOralCoda. Together, these constraints are ranked to account for the observed phonological adaptations. Among the segmental changes, several phenomena such as fricative stopping and glottalization are commonly attested in many Southeast Asian English varieties such as Malaysian English and Philippine English.

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