1. I have been studying for the test since 12 P.M.
I haven't been studying for the test for 2 days.
2. I have been visiting my grandma since I was a child.
I haven't been visiting my grandma for a week.
3. I have been at the cinema since 1 year.
I haven't been at the cinema for 6 days.
4. I have been seeing my best friend since 13 years.
I haven't been seeing my best friend for 23 hours.