Quora is one of the best social networks in terms of questions and answers. Needless to say, there are numerous questions and answers about the English language. This is a particularly good example: 

QUESTION

What is the most misspelt word in the English language?

ANSWER

“May be” and “maybe.” They are different!

May be just means might be, a verb phrase.
Example: Why isn’t Frank at work today? I don’t know, he may be on holiday.

Maybe means perhaps, an adverb.
Example: maybe you should talk to him.