In addition to playing Pictionary to illustrate the difference between concrete and abstract subjects, I often do a little mini-activity to illustrate the difference between robust, active, lively verbs and the weaksauce “to be” verb that just sits around all day doing nothing but existing.
It’s quite simple. I ask a student to volunteer to come up to the front of the class, and I give the student some verbs to perform — jump, dance, shout, sing! — and then I ask the student to “be.”
They get the point.