1) I saw him last week but I´ve not seen him this week.
2)I read this book some years ago.
3)I have never been in Moscow
4)He has just done his homework
5)We met each other yesterday at school
6)I´ve seen this film today.
7)Peter saw this film yesterday.
8)I have already written the exercise, it is not difficult.
9)Ann didn´t do her homework yesterday.
10)I´ve not seen him since Monday.
11)I sent him a letter last month but he has not got.
Лучше прочесть правила использования этих времён, а также их отличия, чтобы не путать в будущем:
https://www.start2study.ru/english-grammar/past-simple-present-perfect-difference/А вообще, Past Simple используется, когда нужно сказать о действии, которое уже завершено в !!!прошлом. Present Perfect - когда речь идёт о результате, имеющим значение в данный момент.
Write the verbs in the right tense.
1. I (to see) him last week but I (not to see) him this week,.
2. I (to read) this book some years ago.
3. I never (to be) to Moscow.
4. He just (to do) his homework.
5. We (to meet) each other yesterday at school.
6. I (to see) this film today.
7. Peter (to see) this film yesterday.
8. I already ( to write) the exercise, it is not difficult.
9. Ann (not to do) her homework yesterday.
10. I (not to see) him since Monday.
11. I (to send) him a letter last month but he (not to get).