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 code-switching 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 discoverieshave also been conducted.
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