Буду очень признательна за помощь. Correct the errors if necessary1. While

Буду очень признательна за помощь. Correct the errors if necessary

1. While I drank tea, mother was cooking.

2. When we was entering the room, we see that our son slept.

3. The party was great! The whole evening we enjoyed ourselves.

4. I wasn't sleeping at 10. At that time I walked my dog.

5. Sara was being busy and she couldn't answer the phone.

6. Alex was absent yesterday. He was at home doing his lessons.

7. I looked at Dan. He danced with Mary.

8. Katy was trying to open the door when we saw her.

9. Were you having a good time at the party?

10. Granny was set in the arm-chair and began reading.

11. When Sue opened the door, she saw all her friends.

12. He didn't eat when I came yesterday. He was reading a book.