This research examined the interlanguage syntax of high school students of English in Zawiya, Libya in the area of the noun phrase (NP), focusing on the closed system elements that can occur before or after the noun head. It is based on the assumption that those students encounter difficulties in forming and using the English noun phrase. The findings demonstrated that a great deal of students' errors could be explained by overgeneralization and interference from students' mother tongue, though

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... some other errors challenge explanations offered by contrastive analysis of English and Arabic.