In recent years,the use of first language(L1)in teaching of second and foreign languages(L2/FL)has been a highly con troversial issue in language teaching and learning studies.This qualitative case study of four American instructors use of codeswitching in their FL teaching explores in what occasion,in what ways,and for what reasons the instructors switched between stu dents’native language and target languages.The results indicate that instructors’choices are to a great extent influenced by vari ous factors,including their personal preferences,class subjects,and communicative purposes.Discussions about new discoveries have also been conducted.
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