When the student wins a point, the teacher raises his game and we start again. If the student cannot win a point, the teacher lowers his game until s/he can win a point. But you MUST RETURN THE BALL!

i.e. ask questions, answer questions, respond to the teacher's inputs.

Otherwise you get NOWHERE...

The picture above shows the best case--a successful English lesson.

Let's see what sometimes happens...

The worst case