Early in the school year, talk with students about the positive connection between discussion, thinking, and their home languages. In addition, teach them to "code switch" across registers. A register is defined as the level of formality in language that's determined by the context in which it is spoken or written. We have three common registers—a social or community register, a "business" register, and a more formal "academic" register.
Often we have discussions about the language we use at home, on the playground and in the classroom. Using this terminology and teaching students the differences may impact how they communicate for learning.