In a classroom there are two parts: teacher and students, ok.
Both have to participate a lot: obviously the teacher will provide massive input, but we must make the students take part of the class massively – all of them, according to their achievement capability, which could be great in most cases!
Have them contribute, have each one participate, if possible; and several times, so they carry part of the burden of the class.
They'll contribute with the answers to a drill exercise from their textbooks, or answers to a question by us, etc. The point is they must participate loads. / Photo from: www wallpaperssnoweb com