Student or Learner
Any difference between the following two?
Students, you may dismiss.
You could say, "Students, you are dismissed" or "Students, you may leave now".
Students, you may dismiss. - This means that the students do the action of dismissing, which is not logical, of course. Students don't typically dismiss themselves. Also, "dismiss" is a transitive verb, which means it requires an object. Therefore, it would sound very strange to say "the teacher is dismissing".
I suppose the students could dismiss themselves if the teacher somehow became incapacitated. For example, the teacher could fall asleep. In such a case, the class would have to dismiss itself.