Bonjour !
Exercice 1
a. I've been working in this company for fifteen years.
b. .. I bet you haven't cleaned it for a very long time !
c. I've known Richard since last September.
d. Sue has lived in Tokyo for two months.
e. I haven't seen Karen since her birthday party.
f. We haven't visited my American cousins since 2001.
Exercice 2
a. It has been raining for one hour.
b. My sister has not been learning her English lessons.
c. I have been waiting for you for two hours.
d. The fridge is empty. Mum has not been shopping.
e. .. she has been working a lot recently.
f. I'm sure you have been smoking in here.
Exercice 3
a. The postman has just arrived.
b. You've broken the window.
c. I've been writing letters since two o'clock.
d. I've written three letters today.
N'hésite pas si tu as des questions :)
