Change the verb into the correct form:
1. You (wait) for 2 hours when I (arrive).
2. Janet (study) for 5 years when she (get) her degree.
3. We (talk) for an hour when I (leave).
4. They (drive) for 6 hours when they (get) there.
5. Sam (be) tired when he (return) because he (jog) for over 2 hours.
6. My cooking (be) much better when I (return) because I (practice) for a whole month.
7. They (have) all the things they need because they (shop) for the whole afternoon.
8. We (exercise) the entire morning, so we will (want) to rest.
9. Monica (prepare) the whole weekend so she (pass) the test.
10. They (swim) for 1.5 hours when the sun (set).
11. You (watch) television for 6 hours when I (come) back.
12. By the time you (return), it (rain) heavily.
13. She (use) the car for a week by the time she (bring) it back.
14. I (work) here for 15 years next month.
15. We (fly) for 16 hours when we (arrive).