At this time yesterday, I (prepare) …………………………. for my son’s birthday party.

18. What you (do) …………………………. at 8 pm yesterday?

19. Where you (go) …………………………. when I (see) you last weekend?

20. They (not go) …………………………. to school when I (meet ) …………………. them yesterday.

21. My mother (not do) …………………………. the housework when my father came home.

22. My sister (read) ……………………… books while my brother (play) football yesterday afternoon.