A: What happened when you were having breakfast?#
B: Some one knocked at the door when I was having breakfast.#
A: What happened when you were leaving the house?#
B: When I was leaving the house, The postman arrived.#
A: What happened when you were opening the front door?#
B: Just as I was opening the front door, the telephone rang.#
A: What happened while she was getting off the bus?#
B: She slipped and hurt herself while she was getting off the bus.#
A: What happened while she was shaving?#
B: She cut himself while he was shaving.#
A: What was her doing while you were working in the garden?#
B: My wife was cooking the dinner while I was working in the garden.&