В 1 задании у тебя всё правильно,
во 2 исправляю ошибки: 3) Where is Mark? - HE is...
4) Is Lily 5? - No, SHE isn't
5) Are you and Ann sisters? - No, WE aren't
6) Are there snakes? - Yes, THERE are
3 задание: 1) are
2) is
3) is
4) am
5) are
6) are
В 4 всё правильно