Abstract:
This study deals with Grammatical Error in English teachers’ oral communication. The objectives of the study are to investigate the types of grammatical errors and to describe the causes of Grammatical Errors produced by English teacher in Raudhatul Hasanah Boarding School. In this study was conducted by applying descriptive qualitative design. The source of the data were taken from teachers’ oral communication video recorded in the classroom. The data were analized by using documentary techniques of Miles, Huberman and Saldana (2014). It was consisted of three steps were data collection, data condensation, data display and conclusion drawing or verification. The finding of this study were found there were 11 sentences which having grammatical errors from the 4 videos. Those error were omission, misinformation, misordering and addition. From these types of errors, omission were 4, misinformation were 3, misordering were 2 and addition were 2. There were errors occured in intralingual causes, especially in arranged the pattern of tenses and good grammatical structure. This researcher suggests the next researcher develop this study by using different object which are not in this study. It could be in oral communication each genre or other speaking structure
