Ex.1
1. Were they at the restaurant?
2. Was the milk in the fridge?
3. Were you and dad at the stadium?
4. Were there some muffins on the plate?
5. Was mum at the supermarket?
6. Was there a bottle of water in her bag?
Ex.2
1. No, they weren't.
2. Yes, it was.
3. No, we weren't.
4. No, there weren't.
5. Yes, she was.
6. Yes, there was.