1)We may go to the Volga
2)She may come tomorrow
3)I may buy this book in Moscow
4)She may send us a tekegram
5)They may forget to bring the newspaper
6)My brother may have forgotten to ring you up
7)She may have bought the tickets
8)He may have already done his homework
9)My sister may have already spoken to them
10)They may have gone abroad
11)Grandmother may be sleeping
12)The children may be playing at the river
13)They may be discussing the question at the moment
14)They may be having dinner at the moment
15)He may be lying on the grass and looking at the clouds now