1. When he (to return) to St. Petersburg, he (to call) on us. 2. If I (to see) him, I (to tell) him about their letter. 3. We (to gather) at our place when my brother (to come) back from Africa. 4. I (to sing) this song with yo...

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 will  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  have) a good talk. 8. He   had gone   to the Public Library very often when he was a student./ He   will go to the Public Library very often when he is  a student 9. As soon as I return) from school, I ( will  ring) you up. 10. You  will (to pass) many towns and villages on your way before you  arrive) in Moscow. 11.i will  stay) at home till she   comes . Then we will (to go) to the theatre if she brings  tickets. 12. After i finish) school, I  will (to enter) the University.