Maybe versus May be

When to use "maybe" and when to use "may be"


It is a common mistake to use the single word "maybe" when what you should use is the two-word phrase "may be".  When do you use one, and when do you use two?
A: Do you want to go to the store?
B: Maybe
I may be going to the store.
I don't know if I want to go to the store, but maybe.
I may be in Denver next week, but maybe not.
Maybe we shouldn't do that, you may be busy then.
My cat may be having kittens tonight, but maybe they won't arrive until tomorrow.
John and Susan may be right, you may be right, the whole world may be right!  But just maybe I'm right!