Abstract
This study aims at determining the essential properties of relative clause structures in standard English and standard Arabic languages, with the aim of finding out similarities and differences between the two languages. To achieve this aim the study examines the syntactic and semantic functions of the relative clauses in both languages. In this study, the researcher describes relative clauses in English and Arabic, showing thier syntactic structures, thier types, thier usage, relative pronouns, embedding, etc. An analysis of relative in English and Arabic was undertaken to compare and contrast relative clauses in English and relative clauses in Arabic. The study concludes that the formation of relative clauses in English and Arabic is similar in many ways, however there are certain aspects in which they are distinct.