Maybe and may be are almost identical, but that little space makes a big difference that may be confused by native speakers. Maybe this lesson will help you understand.
Maybe is an adverb that means "possibly, perhaps." It is used with verbs.
Maybe I can help.
Maybe Tom knows.
You could call Pete, maybe.
It can also be a response to a question.
"Are you coming with us?"
May be is made up of two verbs (the helping verb may and the infinitive be) which together refer to a possibility. They are not used with another verb.
I may be of some assistance.
That may be true.
Pete may be late to the party.
The Bottom Line
The meanings of maybe and may be are similar; the different uses are grammatical. Maybe must be used with or in reponse to a verb, whereas may be is a set of two verbs.
Generally speaking, if there’s a verb in the clause, if you’re tacking it on to the end of a sentence, or if you’re responding to a question, maybe is the correct choice. Otherwise, may be may be your best bet.