This study aims at investigating the usage of Arabic affixation for learning English affixation benefiting of the similarities for fastening the learning period. Word formation and sentence building can be easy when taught through first language. This study was done in Alhumiera high secondary school for girls in Obied town, south Kordofan state, Sudan. A class (level two) of forty girls sat for a pre-test in English affixation and word formation, the researcher designed a model for teaching English affixation through Arabic affixation and word formation to facilitate learning process. The same group sat for the same test after having been taught English affixation through the model. The result obtained by the students in the post test is higher than the result obtained in the pre-test. The model proved to be very supportive and the researcher recommends that it should be used for teaching English affixation
