This research involved Thai and Indonesian language. Indonesia is a
multilingual country which has 749 dialects thoroughly. Dialect influences the way
people speak foreign language in term of pronunciation, grammar and accent. In this
research, the objects are Javanese, Sundanese, Isaan, Pattani-Malay. Non-native
English speakers (NNES) may find difficulties in learning or mastering English, in this
case, in term of pronouncing English consonant phonemes. This research aimed to
elaborate the varieties of English consonant phonemes produced by NNES, to
describe the English consonant phonemes influenced by pronunciation difficulties,
and to elaborate the reason of NNES in making such English consonant varieties.
The method of this research is mixed method research. It means, the
researcher employed qualitative and quantitative method to collect, to analyze, and
to draw the conclusion of the data analysis. The technique of collecting data was
recording and interviewing. The respondents were 3rd and 4th year English
undergraduate students. In addition, the researcher employed Contrastive Analysis
theory pioneered by Charles C. Fries (1945) to analyze the data.
As the result, the researcher found varieties of English consonants
pronunciation uttered by four dialects in term of substitution initial consonants,
substitution in final consonants, substitution in middle consonants, addition in initial
consonants, addition in final consonants, and omission in final consonants. In
conclusion, Isaan student had difficulties in pronouncing allophones /z/, /θ/, /ð/, /ʃ/,
/v/, /tʃ/, /b/, /dʒ/, /d/, /l/, /t/, /s/, /k/, /b/. Pattani-Malay student had difficulties in
pronouncing allophones /z/, /θ/, /ð/, /ʃ/, /v/, /tʃ/, /b/, /dʒ/, /k/, /s/. Meanwhile,
Javanese student had difficulties in pronouncing /θ/, /ð/, /ʃ/, /v/, /tʃ/, /z/, /dʒ/, /k/,
/w/, /g/. Sundanese student had difficulties in pronouncing allophones /ð/, /v/, /tʃ/,
/θ/, /p/, /ʃ/, /f/, /s/. Furthermore, Isaan student had the highest varieties in
pronouncing English consonants. Otherwise, Sundanese student had the lowest
varieties.