Задание предполагает переписывание предложений с использованием конструкции 'used to', которая обозначает привычные действия или состояния в прошлом, которые сейчас не происходят.
Ответ: 1. We used to wear a school uniform, but now we don't. 2. I didn't use to have lunch at school, but now I do. 3. My mum used to drive a small car, but now she has a big one. 4. My friends used to stay at home on Saturdays, but now they go out. 5. Our teachers used to make us write essays, but now they give us projects.