Употребить презент перфект континиус там, где это нужно!
i (work) here since 1999.
2. we (know) each other for 3 years.
3. they (not/ live) here for long.
4. i (learn) the guitar since i was a child.
5. you (never/like) ice cream, have you?
6. how long (you, know) about the problem?
7. we (study) it for a year.
8. your visitor(wait) for you since 10 am.