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I’ll agree 100% with this.
I think it is the the school/professor/TA responsibility to teach. You seem to think that a US school that charges $30K per year has no responsibility for the quality of teaching, teachers or their English language skills. Regardless of why there are not enough TAs or why they are willing to work for so little, I believe they should be expected to be fluent in English if teaching in a US college.</p>