1.本课课程的核心句是Someone knocked at the door when I was having breakfast. When I was leaving the house, the postman arrived. Just as I was opening the front door, the telephone rang.
2.本课的核心句是She slipped and hurt herself while she was getting off the bus. He cut himself while he was shaving. My wife was cooking the dinner while I was working in the garden.
3.本课的核心句是What were you doing when he arrived? I was having a bath. when he arrived. What was mary doing when the telephone rang? She was washing the dishes. She was washing the dishes when the telephone rang.
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