The pattern for questions is as follows: (Interrogative Word) - Auxiliary - Subject - (rest of the verb) - (Complements) If there's an auxiliary in your affirmative sentence, then use it. Otherwise, use do, does, did. "They can sleep in the morning" > IW: HOW - Auxiliary:CAN - Subject: THEY - Rest of the verb: SLEEP - Complement: IN THE MORNING.
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