1. I am writing an English exercise now.

2. I was writing an English exercise at this time yesterday.

3. My little sister is sleeping now.

4. My little sister was sleeping at this time yesterday.

5. My friends are not doing their homework now. They are playing volleyball.

6. My friends were not doing their homework at seven o’clock yesterday. They were playing volleyball.

7. She was reading the whole evening yesterday.

8. She is not reading now.

9. Now she is going to school.

10. What are you doing now? - I am drinking tea.

11. Were you drinking tea at this time yesterday? - No, I was not drinking tea at this time yesterday, I was eating a banana.

12. My sister is fond of reading. She was reading the whole evening yesterday, and now she is reading again.

13. Look! My cat is playing with a ball.

14. When I went out into the garden, the sun was shining and birds were singing in the trees.

15. Are you eating ice cream now?

16. Were you eating ice cream when I rang you up yesterday?

17. What is your father doing now?

18. What was your father doing from eight till nine yesterday?

19. Why is she crying now?

20. Why was she crying when I saw her yesterday?

21. I am enjoying my holiday now.