1 when he returns to St. Petersburg, he will call 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. ......