Два примера на употребление maybe-may be

Maybe 
1. Maybe I can do it. Возможно я смогу сделать это.
2. Maybe she got lost. Возможно она потерялась.

May be:
1. He may be a good person. Он может быть хорошим человеком.
2. It may be rain. Возможен дождь.  

In an earthquake your house may be badly damaged.
It may be an unfulfilled dream.
Maybe Julie was right when she said I was jealous.
Maybe I will go to the dentist tomorrow.