1. she's been studying the subject for a couple of years.
2. I've heard a lot of interesting stories about Mark.
3. Some of you haven't been working hard enough.
4.I've been coming here for many years.
5. He hasn't spent much time in Brazil.
6.a few of us have stayed in prague before.
7. She's been taking many days off work too.
8. he's been trying find some information.
9. I haven't seen you for a few days.
10.my mother has been doing a lot of gardening .