Code-mixing of Arabic and English in teaching science&quot

This paper investigates mixing Arabic and English in science lectures. The phenomenon is examined mainly with reference to frequency, grammatical categories involved, and adzquacy of the syntactic constraints proposed in the literature for providing a structural description of this practice. The results show that the alternate use of the two languages in teaching is a prominent feature of the lectures and occurs in different grammatical categories to various degrees. However, the conditioning factors suggested in the literature are inappropriate for a grammatical characterization of code-mixing. So, it is suggested that further research should examine the sociolinguistic and psycholinguistic factors involved if a satisfactory description of such mixing is to be provided.