1. I (to see) you before you (to start)? 2. What he (to do) when he (to come) home? 3. Where they (to go) if the weather (to be) fine? 4. He (to ring) me up when he (to return) home. 5. If it (to rain), we (to stay) at home. 6. She (to walk) home if it (not to be) too cold. 7. I am sure he (to come) to say good-bye to us before he (to leave) St. Petersburg. 8. Please turn off the light when you (to leave) the room. 9. If we (to be) tired, we (to stop) at a small village half-way to Moscow and (to have) a short rest and a meal there. 10. If you (to miss) the 10.30 train, there is another at 10.35. 11. She (to make) all the arrangements about it before she (to fly) there. 12. Before he (to start) for London, he (to spend) a day or two at a rest-home not far from here.