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Eight Year Old Arabic Grammatical Acquisition (A Longitudinal Study using MLU's Methode)

: Children Language Acquisition is one of the applied linguistic studies. The research on language acquisition has been carried out with various methods, one of them is the MLU (mean length of utterance) method The purpose of the study is to find out the grammar of Arabic which consists of vocabulary, verbs, numbers, nouns, utterances in the form of sentences, and pronouns obtained by eight-year-olds. The method used in this research is descriptive method with longitudinal technique. Data collection uses MLU techniques, interviews, and observation. Data source is a child called Maisa, Data analysis was conducted by reduction, classification, and interpretation. The results of the studyshowed that children as young as 8 years old acquired the vocabulary of Arabic, and could say short speeches due to environmental factors and self-development factors.