Past simple or present perfect. exercises. complete the pairs of sentences. use the present perfect in one sentence and the past simple in the other. 1. i (know) ......... her for six years. 2. i (know) ......... him when i was at school. 3. he (live) ......... in paris from 1997 to 2000. 4. he (live) ......... in new york since 2001. 5. where's pete? i (not see) ......... him for ages. 6. i (not see) ........... pete last night. 7. we (be) ............ at primary school from 1993 to 1998. 8. we (be) ............ in this class since september. 9. i (not watch) ........... this video yet. 10. i (not watch) ........... a video at the weekend.

Here are the completed sentences with the correct verb forms. Grammar Rules Applied

• Past Simple: Used for actions that started and finished in the past. It often includes specific time markers like when I was at school, from 1997 to 2000, or last night.
• Present Perfect: Used for actions that started in the past and continue to the present, or for actions where the time is not specific/finished. It often uses markers like for, since, and yet.

1. I have known her for six years.
   (The relationship continues until now.)
2. I knew him when I was at school.
   (A finished state in the past.)
3. He lived in Paris from 1997 to 2000.
   (A completed period of time.)
4. He has lived in New York since 2001.
   (He moved there in 2001 and still lives there.)
5. Where's Pete? I haven't seen him for ages.
   (Up to the present moment.)
6. I didn't see Pete last night.
   (A specific finished time.)
7. We were at primary school from 1993 to 1998.
   (A finished period in the past.)
8. We have been in this class since September.
   (We are still in the class now.)
9. I haven't watched this video yet.
   (Action expected to happen; "yet" signals present perfect.)
10. I didn't watch a video at the weekend.
    (The weekend is now over.)

Would you like me to provide more practice sentences focusing specifically on the difference between "for" and "since"?