1. I've written to them three times. (not reply) I've asked you again and again. (not do it)
He lost his pen a week ago. (not find it)
5. He borrowed my book last year. (not give it back)
3. I lent him $10 last month. (not give it back)
6. She went to New York six months ago. (not return it)
7. She gave me $2 a week ago. (not return it)
I finished reading my library books a long time ago. (not change them)
9. She went to the bus-stop half an hour ago. (the bus not come)
2.
4.
8.
10. He's still studying that lesson. (not learn it)
using YET