Abstract
Betawi language is the regional language that is most closely related to Indonesian because it has a vocabulary that is not much different and there is a certain application of phonemes in the sound of words, causing interference in the phonological sub-study in Indonesian, namely phoneme changes. This study aims to identify and explain variations in phoneme changes as well as grammatical meanings resulting from these changes. The research method used is a qualitative descriptive method with primary data sources, namely words spoken by Betawi speakers. Data collection techniques use interview, fishing rod, intensive listening, and note-taking techniques. Data analysis techniques carried out by researchers include: (1) taking a close look at the data that has been collected, (2) identifying data based on their groups, (3) analyzing data, (4) concluding and presenting the results. The results showed that there were variations in phoneme changes caused by agreement in the geographical scope, afferes, syncope, and apocope type contractions, as well as monophtongization. In addition, there is no change in the grammatical meaning of each word found.
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