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This research discusses the pattern of ungrammatical Indonesian language in student thesis writing. This research aimed 1) to describe the pattern of ungrammatical Indonesian in student thesis writing, and 2) to analyze the pattern of ungrammatical Indonesian in student thesis writing. This research used eclectic theories about morpho-syntax, syntax, and task words. This research used descriptive analysis method. The work steps of this research begin with identifying patterns of ungrammatical Indonesian language in student thesis writing, then analyzing and describing it. The results of this research show that there are several patterns of ungrammatical Indonesian language morphosyntactically, combining the affixes me-...-i and me-...-kan, redupliation, and from a syntactic perspective there are ungrammatical structures of phrases, clauses and complete sentences, there are sentences with no subject, sentences with no predicate, and sentences with no subject and no predicate. The research results in terms of task words showed ungrammaticalities in the application of prepositions and conjunctions.
Susanto et al. (Mon,) studied this question.