ПОМОГИТЕ, пожалуйста!!! 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.