[HUE]

I don't give rewards per se, but I give lots of praise... which is a type of reward. If an activity went well, they struggled but tried on an especially difficult activity, or go above my expectations, I let the student/class know it. My experience has been that a constant and consistent flow of praise gets the class to meet their personal goals and my expectations.

Conversely, when they don't do well, they get advice and criticism. Both go hand in hand, I think. (Of course, I have to make sure the problem wasn't because of me. If, for example, I didn't explain the grammar so well and then there are a lot of mistakes later in the lesson, the students don't rightly deserve criticism. The blame rests with me.)