Maybe is an adverb: perhaps. May be is a verb phrase: might be. Maybe it will rain. It may be too late. Diction as a set is in word choice.
Perhaps versus might be
If you can swap in perhaps, write one word. If you can swap in might be, keep the space. It maybe too late is the usual miss.
Everyday versus every day is another split-or-join pair, in everyday versus every day. Already versus all ready is in already versus all ready. Grammar overall is in ACT grammar rules.
The bottom line
Perhaps: maybe. Might be: may be.
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