A research paper not too long and complex but detailed enough to talk about what is code-switching, code-mixing, and borrowing in English and how it works and what is its connection to language varieties (dialects and accents)
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https://www.slideshare.net/BlancaLake/code-switching-79184533?from_search=0•https://commongroundinternational.com/learning-english/borrowed-words-english-languages/#:~:text=Some%20fun%20facts%20about%20borrowed,that%20is%20original%20about%20English.
Park, Mi Sun (2013). Code-switching and Translanguaging: Potential
Functions in Multilingual Classrooms. Teachers College, Columbia University
Working Papers in TESOL & Applied Linguistics, 13(2), 50-52. https://doi.org/10.7916/salt.v13i2.1332
Rintaro, S. (2023). Japanese EFL Speakers’ Willingness to Communicate in L2
Conversations: The Effects of Code-switching and Translanguaging. The
Electronic Journal for English as a Second Language, 27(3). https://doi.org/10.55593/ej.27107a5