How does the teacher set developmentally appropriate expectations for oral language and model these for students in different group settings?

What does a the teacher do to set developmentally appropriate expectations for oral language and model these for students in a variety of classroom settings, (whole class, small group, individual)? Are different methods used? How does the teacher converse with them, and how do they converse with each other?

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* Participation structures include: Brainstorm, Elaboration, Paraphrase, Turn and Talk, Write-Pair-Share