Chuyển câu chủ động sang câu bị động

chuyển câu chủ động sang câu bị động:
1. I wasn't chatting with my friends while my teacher was teaching the lesson yesterday
2. After the children hadn't finished their homework, they went to bed.
3. When she hadn't đone her work she went to the cinema.
4. I am not going to watch films with my friend because I am sick
5. My sister isn't going to cook a delicious meal for dinner.