1. She has been selling shoes forsince twenty years.

2. They have been living here forsince 1987.

3. You've been waiting here forsince 6 o'clock.

4. He has been mending my car forsince the last two hours.

5. I've been reading this book forsince seven weeks.

6. She has been studying English forsince seven months.

7. He has been sleeping forsince twelve hours.

8. I have been working forsince six o'clock this morning.

9. My mother has been very busy forsince last week.

10. I haven't smoked any cigarettes forsince a year.