Abstract

This study investigated the role of mother tongue on learning English vocabulary by Iranian pre-intermediate EFL learners. For this purpose, 30 female pre-intermediate learners were chosen. After administering a Nelson test participants were selected from the intact classes at Foreign Language Institute in Babol. These 30 partners were randomly allocated to 2 gatherings (one laboratory and the other control) each comprising of 15 partners. The participants received a pre-test comprising 70 English words to ensure that they did not have previous information of objective structures. Experimental group received their instruction, meaning of each target word, and translation of target words with their mother tongue (Persian). But control group just received target language (English) for all activities or instructions. Both teacher and students in this group didn’t allow using Persian. After the treatment, the same pre-test was given to the participants as a post-test to measure the effectiveness of therapy gained. After collecting the data, to respond the research proposal, a t-test was conducted. The results indicated that first language had significant effect on learning English words. The findings of this study are considered to be useful in methodology issue.

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