1. Roger has worked as a dentist for twelve years.
2. Sandra has studied in our class since october.
3. I have known Alex for ages.
4. Ella has worked in the bank only since two weeks.
5. Julia has been to seven countries since she started her journey.
6. Belinda has changed a lot since we met last time.
7. We have been to Tokyo for five days already.
8. Nick has had this car since a year and a half.
9. Joe has been a designer since she graduated from university.
10. James has been my business partner for more than fourtten years.
I drank; i didn't drink; did you drink
I knew; i didn't know; did you know