6.I didn’t call her up 2 days ago. I haven’t called her up for 2 days

7. Did you finish the test an hour ago? Have you finished the test for an hour?

8. I started playing tennis last year. I’ve played tennis since last year

9. We haven't been to the concert for over a year.

=> The last time we were to the concert was over a year ago.

10. We last saw our grandfather two years ago.

=> It's two years since wa last saw our grandfather.