TDOL,
I say sorry again for the mistake I've made. :eggface:
As you see, now I can only tell students to go to search machine and study the appropriate tense for the Past Family. Students have to make a conclusion by themselves. They have to believe me, fortunately.
But it is
not a
grammar solution for the Past Family, as you must agree. We have to find an explanation, and that is why I am seeking for the answer.
I was waiting for the "circular span" theory.