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Complete the student's highly suspicious excuse email to his professor by choosing the correct option for each blank.
I think _________________________ the aliens will return my essay tomorrow. Then again, they _________________________ using my brilliant ideas to power their spaceship!
I think maybe the aliens will return my essay tomorrow. Then again, they may be using my brilliant ideas to power their spaceship!
Maybe (one word) is an adverb meaning "perhaps" or "possibly."
May be (two words) is a verb phrase showing possibility. It consists of the modal verb "may" and the main verb "be." If you can replace it with "might be," you need the two-word version!