Biến đổi các câu sau sang phủ định, câu hỏi và trả lời các câu hỏi đó: He was planting trees in the garden at 4 pm yesterday

Bài 2: 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.
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2. They were working when she came yesterday.
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3. She was painting a picture while her mother was making a cake.
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4. Anne was riding her bike to school when Peter saw her yesterday.
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5. He was typing a letter when his boss went into the room.
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