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Code-Switching in Language Education
In most language education programs, such as English as a Second Language (ESL) programs, educators and learner have significant proficiency differences in their target language (the language that learner is learning). Therefore, under such condition, code-switching is often a very common method to establish communication between educators and learners.[1]

Applications in Language Learning Process
The application of code-switching under such a condition can be divided into two main different situations, one is the interaction between learners and the educator, and the other is the communication between students and classmates.[1] Linguists and educators have different opinions and views toward the use of code-switching under different situations in language teaching, so the two situations will be discussed separately. Assuming that both learners and language teachers have the same native language background, which means that everyone can use their same native language to build normal communication. In addition, the situation of foreign teachers (whose native language is the target language), and students from diverse backgrounds (each student has a different native language) are not included. [3]

Code-Switching Among Learners
In these language education programs, the most common situation is that the learners do not have proficient language skills in the targeting language.[1] For some examples, the vocabulary mastery of the learners is not enough to build the desired conversation or the learners lack of the abilities to construct sentence in the targeting language structure. In this case, it is impractical to build a complete conversation in the target language. In order to establish a clearer conversation in target language, learners often inevitably use code-switching so that they use their mother tongue to fill the gap caused by the lack of proficiency in the target language. Code-switching’s occurrence in this case can reflected in a phenomenon known as "Cited Language"[1]. This phenomenon simply means that Code-switching is used as a tool to fill in the lexical gaps that arise when establishing conversation in the target language. A simple example for this is to ask how to say a certain thing or a certain word in the target language. In addition, students in these language learning programs could actively avoid using Code-switching, either because of their own desire to establish a pure conversation in targeting language or because of the demands of their instructor. This is reflected in the fact that learners in these language programs often use code-switching briefly in a low-voice manner to help form a complete dialogue. Although the presence of code-switching in language learning programs is common, there are some educators who believe that the use of code-switching can cause dependency. For example, with frequent use of code-switching, students do not quickly adapt to speaking purely in the target language [2]. Moreover, in language programs where the native language is quite different from the target language, the use of code-switching can lead to confusion about grammar and other sentence structures.

Code-Switching for Educators
In Contrast with learners, educators usually have a higher level of proficiency in the target language which means they can use the target language for normal communication without barriers. Educators can converse fluently in both languages, so they have a choice as to whether and how often code-switching is used in the language teaching process.[3] From the perspective of learning, in most cases, these frequencies are often inversely correlated with the learners' proficiency in the target language, that is, the higher the proficiency of the learners, the rarer the occurrence of code-switching.

From another perspective, compared to enhancing knowledge construction, some of these moves are done unintentionally because speaking in native languages simply helps reducing the complexity of communication, which simplified communication is also easier for students to understand what their teacher is trying to convey. A code-switched expression can be useful rather than in academic conversation that student actually learning languages through figuring out complicated sentences. These situations might cover maintaining class order, understanding students' mental health state, or making clarifications. Although instructors have the ability to choose whether or not to use code-switching, the question of when and how often to use it remains controversial. It is undeniable that code-switching is a powerful tool for making clarifications in many cases, especially when the scholar is extremely unfamiliar with the target language [4]. But on the other hand, the use of code-switching by teachers can also lead to students not being able to adapt to new language situations.

Reference
[1] Hancock, Mark. (1997). Behind classroom code switching: Layering and language choice in L2 learner interaction. TESOL Quarterly 31.2, 217-235.

[2] Williams-Farrier, Bonnie J. (2017). 'Talkin' bout good & bad' pedagogies: Code-switching vs. comparative rhetorical approaches. College Composition and Communication 69.2, 230-259.

[3] Cahyani, Hilda, Michele de Courcy, and Jenny Barnett. “Teachers’ Code-Switching in Bilingual Classrooms: Exploring Pedagogical and Sociocultural Functions.” International journal of bilingual education and bilingualism 21.4 (2018): 465–479. Web.

[4] Codemeshing in academic writing: Identifying teachable strategies of translanguaging. The Modern Language Journal 95.3, 401-417.