1. She was speaking to a girl when you met her in the street.
2. You were hurring to theatre when they met you yesterday.
3. The boat was sailing when we arrived at the river-port.
4. The bus was waiting for a group of tourists at 10 o'clock a.m. yesterday.
5. They were planning to make a voyage up the Dnieper when I came home.
6. He was reading a book when they knocked at the door.