Sometimes I have to call my stand-in once or twice, because they're sort of reluctant to rat on kids. I share it with classes when I get back. The kids assume I'm angry about something they have done and they begin spilling the beans. This technique works best in our classes. Besides leaving detailed notes for my substitutes, I leave the kids instructions on the board.
Subs say they see students glance up several times to see what they're to do next.
Sometimes I have to call my stand-in once or twice, because they're sort of reluctant to rat on kids. I share it with classes when I get back. The kids clearly understand all of this, accept it, and have markedly upgraded their treatment of substitutes in English. You bet, but the choice to activate that system lies within the kids. They're becoming pretty good hosts to their visiting teachers.