maybe, may be

Maybe or maybe ( one word ) means possibly, or perhaps--
Mom said maybe we can go out for a pizza.
I asked if we could have the day off, and he said maybe.
Maybe we can go to the beach next Saturday.

May be or may be ( two words, rhymes with maybe ) means might happen, or could be correct, probable, or real--
There may be another meeting next week; they will let us know.
This may be the number to the pizza place, but I'm not sure.
This may be the right answer, but we'll have to look it up to find out.
He called to say that he may be late.

Now that you know that, you can say--
"He said there may be overtime on Friday, so maybe we will have to stay late."