Indefinite articles

I was in a Teacher's selection for a school in my country, and one of the coordinators said that she heard a mistake from another teacher that was unacceptable. I tried to figure out why was that,... more

I can’t for the life of me figure out where to use _a_ and where to use _the_ — and where there is no article at all. Is there a simple rule of thumb to memorize? The standard rule you always hear:... more