1. When we arrived at the airport, the secretary had already typed the letters.
2. When the company had finished its work, the chief engineer left the office.
3. The partners discussed some business matters after they had come back from the plant.
4. When the director had studied all the documents closely, he could watch the 10 oclock television news with pleasure.
5. I phoned Mr. Thompson when he hadnt come back home from the office.
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