concept of L1 Interference and precisely the interlingual effect, and claimed that the main cause of committing errors in the process of second language learning is the L1. Put simply: The linguistic background of the language learners badly affects the production in the target language or second language.

The contrastive analysis hypothesis claims that the principal barrier to second language acquisition is the interference of the first language system with the second language system, and that a scientific, structural comparison of the