The main objectives of this study are to investigate the realization of Speech Function in Onang – onang and the reason for their realization. This study is based on descriptive qualitative approach. The data are collected by applying documentary technique. The result of this study reveales that the process of realization of Speech Function in Onang – onang in Mood is realized both congruent and metaphorically. The reasons for realization of Speech Function in Onang- onang are power initiation, Politeness need and also there are different language systems and grammatical structures between North Padang Lawas language and English clause structure.
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