Proszę o sprawdzenie

Temat przeniesiony do archwium.
Bardzo prosze o sprawdzenie czy prawidłowo powstawiałam słowa for i since oraz innych błędów w zdaniach.

We've know each other since 2009
They've lived in France for 5 years
She's been abroad since last December
We have been friends for 10 years
It has been very cold since last Monday
How many good friends have you had since you started school
What has the weather been like for the last few days?
jedyny blad jest w pierwszym zdaniu: knowN (know-knew-known)
reszta ok