The aim of this article was to describe phonetic variations and sound changes in Hong Kong Cantonese (HKC) to provide speech-language pathologists with information about acceptable variants of standard pronunciations for speech sound assessments. Study 1 examined the pattern of variations and changes based on past diachronic research and historical written records. Nine phonetic variations were found. Five in syllable-initial and syllabic contexts: (1) [n-] → [l-], (2) [ŋ-] → Ø-, (3) Ø- → [ŋ-], (4) [k(w)ɔ-] → [kɔ-], (5) syllabic [ŋ̍] → [m̩]; and four in syllable-final contexts: (6) [-ŋ] → [-n], (7) [-n] → [-ŋ], (8) [-k] → [-t], (9) [-t] → [-k]. Historical records demonstrated the pattern of variation and changes in HKC across time. In study 2, a large-scale synchronic study of speakers of differing ages was undertaken to determine acceptable phonetic variations of HKC for speech sound assessments. In the synchronic study, single-words were elicited from 138 children (10;8-12;4) and 112 adults (18-45 years) who spoke Cantonese and lived in Hong Kong. Synchronic evidence demonstrated five acceptable variants in syllable-initial and syllabic contexts: (1) [n-] → [l-], (2) [ŋ-] → Ø-, (3) Ø- → [ŋ-], (4) [k(w)ɔ-] → [kɔ-] and (5) syllabic [ŋ̍] → [m̩] and four incomplete sound changes in syllable-final contexts: (6) [-ŋ] → [-n], (7) [-n] → [-ŋ], (8) [-k] → [-t] and (9) [-t] → [-k]. The incomplete sound changes may still be accepted as variants in speech sound assessments unless related speech problems are indicated.
Keywords: Assessment; cantonese; phonetic variation; sound change; speech articulation test.