1 We have been knowing each other since we were children.
2 The children have played computer game for two hours.
3 Has your sister been having that hairstyle for a long time?
4 I have been loving her from the first day we met
5 My intenet connection have not been working since yesterday.
6 How long have you waited?
7 I have been a teacher for three years
8 It has been snowing this morning
9 Sam has not studied enough recently
10 Have you been living in London for a long time?