Здраствуйте.Употребите глаголы в скобках в Future Simple, не забывая о придаточных предложениях времени и условия:

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.

1 returns, will call 2 see, will tell 3 will gather, comes back 4 will sing, tell 5 will join, gather 6        7 stay, will call, will have 8 went, was 9 return, will ring 10 will pass, arrive