It's fine is you don't mind "yes" as the answer. I prefer who, what, when, where, why and how questions. They require more than a yes or no answer.
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Thinking SpainYes the answer is, 'Yes there was. A policeman.'"Yes (there was)" is an answer to "was there...?"
Shawn79After the listening portion, are your questions and answers oral? The reason for my suggestion is what happens if a student just answers you "yes" and doesn't tell you it was "a policeman." Do you follow-up with "who was it?" or is it a written question that they would get wrong if they failed to say more than just "yes".Hi Shawn,