Biến đổi các câu sau sang phủ định, câu hỏi và trả lời các câu hỏi đó?
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 (hoặc 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 (hoặc No, they weren't)