1. john (is visiting) his parents this weekend. 2. he (takes) me to school every day. 3. be quiet. the baby (is sleeping). 4. he (always bites) his nails. 5. water (doesn't boil) at 80 c. 6. the bus (leaves) at 6-30 pm. 7. (is he doing) his homework now? 8. what time (do you start) work? 9. he (isn't watching) tv now. 10. she (doesn't like) flying by plane. 11. (are they leaving) next week? 12. i (don't think) he's in.