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Your messy roommate left a very confusing, half-written sticky note on the fridge. Select ALL the grammatically correct questions you could text them to figure out what happened.
The correct answers are Who threw away my favorite coffee mug? and What did the landlord say about the noise?
Who threw away... is a subject question. Because "Who" is performing the action, we don't use did.
What did the landlord say... is an object question. Because "the landlord" is the subject performing the action, we need the auxiliary verb did to form the question.
"Who did break..." is incorrect because it incorrectly uses an auxiliary verb in a subject question. "What you put..." is incorrect because it is missing the auxiliary verb did for an object question.