Odpowiedź:
1. Your friend was sitting on the floor.
Your friend wasn't sitting on the floor.
Was your friend sitting on the floor?
2. My sister and I were making pancakes.
My sister and I weren't making pancakes.
Weren't my sister and I making pancakes?
3. I was listening to music all day yesterday.
I wasn't listening to music all day yesterday.
Was I listening to music all day yesterday?