Abstract
Learning and teaching Arabic to non-native speakers is not easy since it is a foreign language and an unexperienced language. Hence, learners of Arabic as a second language at the university level make mistakes to identify grammatical errors in simple sentences and construct correct sentences in them while they have studied Arabic grammar in Arabic colleges in Sri Lanka for 5-7 years and in government schools as well. This research aims to identify grammatical and linguistic errors in simple sentences when writing among second language learners of Arabic. Therefore, the researchers rely in this study on the descriptive-analytical method. The following data are also used to collect information. As for the primary data, the researcher deals with the questionnaire and observation. In the questionnaire, the researcher randomly selects 159 male and female students from the Department of Arabic Language at the South Eastern University of Sri Lanka. As for secondary data, it depends on books, magazines, research, and website articles. The researcher uses the analysis method with the help of using MS Excel to analyze and verify the obtained information and evaluate its results. This research has obtained several results, including; that the students have all knowledge of the theories of simple sentences, so they like to write simple sentences and are not confused about the beginning of simple sentences. But as for the practical side, they know the writing of simple sentences in various patterns at a medium level. They also correct the error in simple sentences at a medium level.

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