3. We ………………………………….(join) in the volunteering program next month. 4. At this time tomorrow, I ………………………………(stay) at home and …………………… (prepare) the dinner. 5. My students ……………………………(study) English in this class for 3 years. 6. When he ………………….(make) a phone call, I …………………….(listen) to music in my room. 7. My son …………………………(finish) his project by the time the teacher asked for it. 8. My children ……………………………(pick) up the guavas in the garden at 6p.m yesterday. 9. The wind is heavy. The dragonflies are flying low. It ……………………………….(rain) 10. My father ……………………………...(collect) old books when he was 15 years old. 11. Before we arrived at the cinema, the film ……………………….(start) for 10 minutes. 12. – My bike is broken. - Oh, I …………………………(come) to your house and …………………..(pick) you up. 13. How long ……………they ………………(wait) us? => For 30 minutes. 14. Farmers often …………………..(not harvest) rice in spring. 15. After my mom had done gardening, she cleaned the house. => Before