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Help Detective Barnaby interrogate the bewildered pastry chef by choosing the correct question forms for his report.
"Alright, let's get the facts straight. First of all, who _________________________ the giant chocolate sculpture from the kitchen? And more importantly, who _________________________ running away with a pocket full of frosting?"
The correct answers are stole and did you see.
When the question word (like who) is the subject of the sentence, we do not use an auxiliary verb like do or did. We just use the main verb (Who stole the sculpture?).
When the question word is the object of the sentence, we must use an auxiliary verb (Who did you see?).