How is being multilingual a benefit to language teachers? Should teachers be at least bilingual? Should teachers introduce dialectal code-switching to their students?

Read, if needed: https://en.wikipedia.org/wiki/International_Phonetic_Alphabet
These transformations are readily identifiable to society, and society pre-judges people based on the dialect & language ability that they use. You will answer the question, below, about sociology and provide an in depth multi-paragraph response.

How is being multilingual a benefit to language teachers? Should teachers be at least bilingual? Should teachers introduce dialectal code-switching to their students?

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