Did you have breakfast this morning?

Have you had breakfast this morning? Which explanation is correct in this context?

Where ……. you been?

Where ….. you going now?

If ……. gone to the party last year, I would not have seen my best friend.

I …. going to school tomorrow.

Ali - Do you know that Ahmet is in the hospital? Hasan - Really! I don’t know. I ……. visit him tomorrow.

I …. going to school tomorrow

What does “inexhaustible “ mean?