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?
Trả lời : 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?
Trả lời : 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?
Trả lời : 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?
Trả lời : 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?
Trả lời : Yes, he was./ No, he wasn't.
* Chú thích: (-) là phủ định
(?) là nghi vấn