In this paper, while using a brief introduction to the importance of applied linguistics in practical fields especially learning second language teaching, factors that influence learning process will be examined. Then, the differences between learners in terms of learning abilities and similarities between learners of the first and second language will be considered. Later on, linguistic errors by a group of Iranian students in the use of prepositions which accompany verbs will be studied and analyzed. Next, the possible impact of gender on the difference on their performance in the relevant test will be compared. Findings show the very little difference between the two groups. After presenting the research results, a set of practical suggestions for the purpose of improving the quality of English language education in Iran will be mentioned.

Key words: Errors, Learner, English Language , Verb,  Particles, Mashhad