1. When he returns to St. Petersburg, he will call on us. 2. If I see him, I will tell him about their letter. 3. We will gather at our place when my brother comes back from Africa. 4. I'll sing this song with you if you tell me the words. 5. I hope you will join us when we gather in our country house the next time. 6. What will you do when you come home? 7. If I stay some more days in your town, I will call on you and we'll have a good talk. 8. He will go to the Public Library very often when he is a student. 9. As soon as I return from school, I'll ring you up. 10. You will pass many towns and villages on your way before you arrive in Moscow. 11.I'll stay at home till she comes. Then we will go to the theatre if she brings tickets. 12. After I finish school, I enter the University.