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Expressing possession in French can be a little bit tricky for native English-speakers as the possessive adjectives work in a completely different way.

Have a look at the translation below:

My car is yellow. My book is red.
Ma voiture est jaune. Mon livre est rouge.

Her car is yellow. His book is red.
Sa voiture est jaune. Son livre est rouge.

In English, the possessive adjective agrees with the possessor:
E.g. Her car is yellow. His book is red.

In French, the possessive adjective agrees with the thing that is possessed:
E.g Sa voiture est jaune. Son livre est rouge.

What is important is the gender of the thing that is possessed, so “sa” could be translated as “his” OR “her”. Likewise, “son” could be translated as “his” OR “her”.

However, in the plural form there isn’t difference between the masculine and the feminine):
Ma voiture est jaune. Mon livre est rouge
Mes voitures sont jaunes. Mes livres sont rouges.

Chart of French possessive adjectives:

Masculine
Singular
Masculine
Plural
Feminine
Singular
Feminine
Plural
 mon mes ma mes
 ton  tes  ta  tes
 son  ses  sa  ses
 notre  nos  notre  nos
 votre  vos  votre  vos
 leur  leurs  leur  leurs

Another easy way to express the possession in French ? Just use the preposition “de”.
Mary’s car. La voiture de Marie. Paul’s books. Les livres de Paul