Second language acquisition Study and teaching English language 3 Foreign speakers 2 Language and languages 2 Applied linguistics 1 Code switching (Linguistics) 1 Competence and performance (Linguistics) 1 Discourse analysis 1 Interlanguage (Language learning) 1 Language transfer (Language learning) 1 Learning, Psychology of 1 Motivation (Psychology) 1 Motivation in education 1 Peer teaching 1 Persian speakers 1 Research 1