Like I have said elsewhere in other posts, last summer in Sukagawa, Japan, Sensei said very, very little during class (actually nothing I can remember, now that I think about it).
When we returned, and I was asked by Sensei here to teach the odd class, I said very little at first. After class fellow students would be asking "So, tell us; what was it like in Japan? What did you learn? What were classes like?"
Then it hit me; Sensei's English was excellent, but he chose to say little during class. And the senior students (nidans, sandans, yondans), who only spoke Japanese, said nothing to each other or to us. Yet we still managed to learn.
Students here get frustrated when I answer "Yes, it is difficult (muskashi?); just keep trying." What else can you do?