Bonjour,
Rappel : le present perfect se construit ainsi : have + participe passé du verbe. Il exprime un bilan. Since est utilisé pour exprimer un évènement ( depuis Noël, depuis la dernière fois) et for pour une durée (depuis deux ans, dpuis une semaine).
1) Bob has been a reporter for several weeks.
2) He has worked for Look magazine since 1996.
3) The Taylors are divorced for six months.
4) My elder sister has lived in Canada since last year.
5) I have wanted to be an explorer since the age of ten.
6) I have a computer of my own since Christmas.
7) I have been interested in science fiction for many years.
8) I have known Brian for 7 years.
Voilà, si tu as des questions n'hésite pas !
