I was wondering if someone could help explain why we don't use the indefinite article in this sentence
There is no couch in the living room
but we do use it in this sentence
There isn't a couch in the living room?
Now I know it has something to do with no vs. not but I can't figure out how to explain to people why there is a difference.
Also, when I think about it, it seems like we almost never use 'a' after no but we do after not... but again, I just came seem to come up with a rule to explain it?