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The detective is interrogating a suspect about the missing Gouda. Select ALL the questions that are grammatically correct and apply to the investigation.
The correct answers are Who stole the cheese?, Who did you see at the scene?, and What happened to the cheese?
When question words like Who or What are the subject of the sentence, we do not use auxiliary verbs like do/does/did (e.g., "Who stole the cheese?", "What happened?").
When the question word is the object, we must use an auxiliary verb (e.g., "Who did you see?"). "Who you saw" is missing this auxiliary verb. Finally, "happen" requires the preposition "to" when referring to the affected object.