11. I haven't seen her since 2007 -> it's..........
12.I haven't been to the dentist's for 2 years -> it's...........
13. It's last year since i last heard from her -> I have.........
14. It's 2 years since i saw her -> I haven't....
15.Na and Mi last visited their parents in 1998 -> it's......
16. She last visited her parents in 1998 -> it's........
17.The last time i saw him was ten years ago -> it's......
18. They haven't phoned us for a month -> it is............
19. They haven't seen my friend for 1 month -> It is 1 month...........
20. John has not had his hair cut for over six months -. it is...........
21.Lan and Maryam have corresponded for 3 years -> it is 3 years .............
22. Lan hasn't written to Maryam gor 2 months -> Lan didn't.........
11. I haven't seen her since 2007 -> it's...13 year since I.last saw her......
12.I haven't been to the dentist's for 2 years -> it's..2.year since the last time I went to the dentist........
13. It's last year since i last heard from her -> I have..heard.from her for 1 year......
14. It's 2 years since i saw her -> I haven't...seen her for 2 years.
15.Na and Mi last visited their parents in 1998 -> it's...22 year since the last time Na and Mi visited their parents...
16. She last visited her parents in 1998 -> it's..22 year since the last time she visited her mother......
17.The last time i saw him was ten years ago -> it's..ten years since the last time I saw.him...
18. They haven't phoned us for a month -> it is.a month since the last time they.phoned ours..........
19. They haven't seen my friend for 1 month -> It is 1 month.since the last time they.saw my.friend........
20. John has not had his hair cut for over six months -. it is..over 6 months since the last time John cut his hair.........
21.Lan and Maryam have corresponded for 3 years -> it is 3 years .since the last time Lan and Maryam corresponded............
22. Lan hasn't written to Maryam gor 2 months -> Lan didn't..write to Maryam 2 months ago.......