Напишите следующие предложения в вопросительной и отрицательной формах: Образец: They were playing all day. Were they

1. It was snowing all day yesterday. Was it snowing all day yesterday? It wasn\'t snowing all day              yesterday.

2. They were doing their homework when I came to see them. Were they doing their homework when      I came to see them? They weren\'t doing their homework when I came to see them.

3. They were cleaning this flat all morning. Were they cleaning this flat all morning? They weren\'t            cleaning this flat all morning.

4. She burnt her hand when she was cooking dinner. Was she cooking dinner when she burnt her            hand? She wasn\'t cooking dinner when she burnt her hand.