Coucou !
1. We have known each other
2. We have learnt many new words
3. I have seen it three times
4. Mr. and Mrs. Tonner have been married
5. The class has already begun
6. He has lived next door
7. Mary has written many letters
8. We have eaten in that restaurant
9. Our teacher has given us a lot of help
10. She has spoken to her landlord
11. We have taken some beautiful pictures
12. They have done all they homework
13. Mrs. Baxter has bought all her groceries
14. Tommy has had a bad cold
15. Frank has worked for that company
16. she has found a beautiful apartment
J'aimerais pouvoir expliquer mais malheureusement il n'y a pas de secret, la construction du present perfect est toujours la même (auxiliaire "have" + particie passé), et donc il faut 'simplement' connaître les participes passés et tous ces fameux irréguliers. Mais ne t'inquiètes pas, ça vient avec le temps si jamais tu décides de continuer l'anglais, à force de les entendre dans les séries etc. ! Courage :)
