62.2 2) When I saw him,he was by himself
3)don't go out by yourself
4)I went on the cinema by myself
5)My sister lives by herself
6)many people live by themselves
62.3
2)They can't see each other 3) they often see each other 4)They don't know each other 5) they're sitting next to each other 6) They gave a present to each other