Past Continuous.
1. I was going to school.
2. She was reading a book.
3. They were writing a letter.
4. They were running fast.
5. We were singing a song.
6. She was drinking lemonade.
7. The cat was eating fish.
8. Kate was doing her homework.
9. Dave was driving a car.
10. The baby was sleeping.
11. They were playing chess.
12. Mike was sitting.
13. I was swimming.
14. She was watching TV.
15. She was feeding birds.
16. She was talking on the phone.
17. They were dancing.
18. Sue was flying.
19. The child was crying.
20. The boy was building a snowman.
21. He was making a cake.