The effectiveness of using the first language to teach a second language has always been controversial. There are different approaches to use or not to use the first language in second language teaching. Learning a second language is basically a bilingual synchronization analysisin which Persian learners try to keep the first and second languages in mind in harmony with each other. The use of them other tongue of Foreign Persian learners has a practical role in explaining, describing contradictions and clarifying the concepts of the second language.

Mother tongue, Second language, Foreign Persian learners