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 you if you (to tell) me the words. 5. i hope you (to join) us when we (to gather) in our country house the next time. 6. what you (to do) when you (to come) home? 7. if i (to stay) some more days in your town, i (to call) on you and we (to have) a good talk. 8. he (to go) to the public library very often when he (to be) a student. 9. as soon as i (to return) from school, i (to ring) you up. 10. you (to pass) many towns and villages on your way before you (to arrive) in moscow. 11.1 (to stay) at home till she (to come). then we (to go) to the theatre if she (to bring) tickets. 12. after i (to finish) school, i (to enter) the university.

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'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 will ring you up.
10. You  will 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 go to the theatre if she brings  tickets.
12. After I finish school, I will enter the University.