1. Helen … (know) this boy for 5 years
2. My friends … ( write) a dictation since 2 p.m.
3. Sam … (drive) a car for five hours now.
4. You … ( look) for information since last Friday.
5. The tourists … (not/ do) the sightseeing since nine o’clock.
6. The wind … (blow) since yesterday.
7. My grandfather … (be) to Spain twice since he was a boy
8. Andy and Den … ( discuss) the plans for their winter holidays for two hours now.