1. You can use "the teacher", "a teacher" or "teachers" without changing the meaning of that sentence. "The teacher" there is used to generalize so the sentence doesn't speak about a specific teacher.
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moon7296support from the teacher or more competent language learners
moon7296The reason the is not added for learners is we don't know how they are competent. . . . . Why not the learners?There are many teachers and many learners. We say "The teacher does this; the learner does that." I don't see any diffe
moon7296Scaffolding means an interactional support from the teacher ...As an isolated sentence, a teacher or teachers also makes sense as part of an abstract definition of scaffolding, because all of these forms can be used to create a generic reference, but I suspect that the text that precedes this sentence describes classroom activiti