(W 133) --- 11.13 -- Il y a, ça fait, depuis.

1.

Mireille lives on Vaugirard Street. (Attention: She buys her clothes [dresses herself] at Prisunic. She lives on Vaugirard Street.) She has been living on Vaugirard Street since she was born. She has been living on Vaugirard Street for nineteen or twenty years.

2.

Cécile and Jean-Denis have been married for two or three years. (Cécile and Jean-Denis are married since two or three years.)
Cécile and Jean-Denis have been married for two or three years. (That makes two or three years that they are married.)

3.

Marie-Laure has been going to school since the age of three. She is now ten. Therefore, she has been going to school for seven years.

4.

Mireille has been resting in the sun since ten after ten in the morning. It is now twenty after ten. Therefore, she has been there for ten minutes.

5.

She has been studying at the Sorbonne since the month of October. We are in the month of May. She has been at the Sorbonne for six months.

6.

The Sorbonne has existed since the thirteenth century. We are in the twenty-first century. Therefore, the Sorbonne has existed for almost eight centuries.