To wszystko jest Present Perfect, wiec nie wiem skąd się tam wzięło to Present Simple XD
5. My parents have bought a new house recently.
6. He haven't been to London yet.
7. My students have just started their holidays.
8. Mark and Catherine have already gone out.
9. I've made coffee for you.
10.Have they ever traved by plane?
11. How many people have you invited?
12. You've been very busy lately.
15. Mark and Paul have known each other for 25 years.
