1. He was planting trees in the garden at 4 pm yesterday.
- He wasn't planting trees in the garden at 4 pm yesterday.
- Was he planting trees in the garden at 4 pm yesterday?
Yes, he was./ No, he wasn't

2. They were working when she came yesterday.
- They weren't working when she came yesterday
- Were they working when she came yesterday?
Yes, they were./ No, they weren't.

3. She was painting a picture while her mother was making a cake.
- She wasn't painting a picture while her mother was making a cake.
- Was she painting a picture while her mother was making a cake?
Yes, she was./ No, she wasn't.

4. Anne was riding her bike to school when Peter saw her yesterday.
- Anne wasn't riding her bike to school when Peter saw her yesterday.
- Was Anne riding her bike to school when Peter saw her yesterday?
Yes, she was./ No, she wasn't.

5. He was typing a letter when his boss went into the room.
- He wasn't typing a letter when his boss went into the room.
- Was he typing a letter when his boss went into the room?
Yes, he was./ No, he wasn't.