3.1. What ............. (you / do ) when the teacher ............(arrive) in class?
2. At 5 pm yesterday, (they / chat) ........................ online.
3. Father ....................(wait) in the car while mother ......................(do) the shopping.
4. He .................(take) a photo when I .................... (feed) the ducks.
5. When we .......................(see) Brian, he ......................... (drive) a taxi.
6. They....................(forget) our lunch at home last Friday.