
Kathryn E. answered 06/30/19
A Linguist who Can Help You Understand Grammar
”Be” is not quite like any other verb in English. It acts as both an auxiliary verb and a main verb, and as a main verb it can be stative, or, as you say, occasionally active in meaning. Your question seems to be more a semantic problem of the main verb “be” rather than a grammatical problem: It is about the stative meaning of “be” (“existing, appearing, seeming”), versus an active (“doing, behaving”) meaning of “be”. Santa at the mall might ask a child, “Have you been being good?” This is the active meaning of be. Santa could have asked the mother, “Is he a good boy?” This would be the stative meaning.