Ex.: Somebody hit me. Who hit you? I hit somebody. Who did you hit?
3. Somebody gave me the key.
4. Something happened.
5. Diane told me something.
6. This book belongs to somebody.
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Ответ:

3. Who gave you the key? I gave you the key. Who did you give the key?

4. What happened? This is happened. What does happen?

5. Who told you sthing? Diane told me sthing. Who did you tell sthing?

6. Who this book belongs to? This book belongs to me. Who does this book belong?

Как-то так….