Past tenses: 1)sandra (paint) for three years before she sold her first painting.2. while lisa (read) a book her brother was listening to music.3. (the girls/help) you with the housework yesterday? 4.tom was very tired.he (play) football for hours.5. susan was very happy because she (win) the first prize.6. lisa was very upset because she (have) a nightmare.7.the secretary (send) letters by the time her boss came to work.8. the research team (fimd) an unusual fossil and took it back to the lab.9.alex (not/go) to school yesterday.10.as tony (play) computer games,his sister was watching tv.11.nick (wait) for an hour before her friend arrived.12.we (not/go) to school yesterday.13.what (do) yesterday? 14. i (see) you in the morning.