1. I have never seen this guy before.
2. Have you already finished your project?
3. My house has been on sale this summer.
4. Kids have just eaten.
5. What have you done with my watch?
6. They haven't heard of Shakespeare up to now.
7. I have worked for 8 hours.
8. Have you seen him recently?
9. No, I haven't seen him lately.
10. Tom hasn't read a book since September.