1)I haven't seen you for hundred years.
2)We are building house now.
3)She is out of breath, what has she been doing?
4)You look tired, what have you been doing?
5)I have been waiting you for 2 hours already.
6)We have been reading this article for 15 minutes already.
7)How long are you washing auto?
8)We are going to repeat this show next week.