Answer:
I stopped corresponding with Ben a long time ago
<em>→ I haven't corresponded with ben since long tim</em>e
7. It’s almost 3 months since I last played badminton.
<em>→ I haven’t played badminton since 3 month
s</em>
8. Her sister didn’t meet her cousin a few years ago.
<em>→ Her sister hasn't met her cousin since few years
</em>
9. I didn’t live in Tra Vinh when I was eight years old.
<em>→ I haven’t lived in Tra Vinh when I was eight</em>
10. We last talked to our form teacher three months ago.
<em>→ We have not talked to our form teacher for three months
</em>
11. My brother stopped smoking four weeks ago.
<em>→ My brother hasn’t smoking since four weeks</em>
12. My teacher hasn’t talked to us since we left school.
<em>→ My teacher last talked to us when we were leaving the school</em>
13. My father hasn’t planted trees in the garden for two months.
<em>→ My father stopped planting tress in garden from 2 months</em>
14. I have not visited Uncle Tri since 2005.
<em>→ I last visited uncle tri in 2005</em>
15. She hasn’t written to John since August.
<em>→ She stopped writing to john from august</em>
16. They stopped producing this kind of toy a long time ago.
<em> They haven’t produced these kinds of toys from years</em>
17 . We last saw Mary when we left university.
<em> We haven’t seen Mary since we left university</em>
18. I last travelled by plane a year ago.
<em>→ I haven’t travelled by plane from year now</em>
19. We stopped communicating with each other by radio a long time ago.
<em> We haven’ t communicated with each other by radio since long time</em>
20. You last helped me when you graduated from college.
<em> You haven’t helped me from when you were graduated from college</em>
<em></em>
