1. when I got home yesterday, my son (sleep) for 2 hours. 2. By the time Mary arrived at the office, her boss (not come) yet. 3. By the time you arrives at the airport, the plane (take) off for 30 minutes. 4. When they came to the meeting, it already (start) . 5. I (cycle) through the park, when I (hear) a strange noise. 6. He (pass) her a message when the teacher (look / not). 7. I (fall) asleep while I (watch) TV last night. 8. Before he (leave) for London, he (ask) one of the tenants in the house to take care of his dog. 9. We (wait) for Jane, when suddenly Louis (come) around the corner. 10. No sooner my friend (come) to Edinburgh than his company (call) him back. 11. Before he (study) English there, he (learn) it in many other language centers