GAMES || Play Converstaion Lines

In each turn, one line moves towards the teacher while the other line moves away from the teacher.  The lines move in opposite directions each time.
For example, all students must takes one step left and the two remaining  students without a partner circle around to the opposite end of their same line. This adds an element of continuous action and change while the teacher monitors only a single end and the assistant teacher monitors the other end or everywhere in between.