Code-switching is an important domain in the sociolingusitics. Since the 1970s, lots of linguists and experts has at⁃tached great importance to it. This paper is a tentative study of code-switching in the teaching English as a second language (TESL) from such aspects: the review of code-switching, principles adhered to the code-switching, factors which leads to the code-switching, and attitudes and functions of code-switching in the TESL.
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