Bonsoir !!!
As you know the possessive adjectives agree in gender & number with the following noun ; with the possessed object and not with the person who possesses as in English ..................
Voilà son affiche. (his)
it could be "her", it would still be "son" ..
EXCEPTION = affiche is a feminine noun but as it begins with a vowel, you can't say "sa" affiche ....... so it's "son"
when the following noun begins with a vowel or a mute 'h' you won't use 'ma' 'ta' 'sa' but 'mon' 'ton' son' .............
singular
mon affiche = my
ton affiche = your (2nd pers. sing.)
notre affiche = our
votre affiche = your (formal vous)
leur affiche = their (3rd p. sing.)
affiches plural (des affiches)
mes affiiches
tes affiches
ses affiches
nos affiches
vos affiches
leurs affiches
