Want to finally get French possessive adjectives right? You are in the right place. These little words (mon, ma, mes, ton, son…) let you say "my", "your" and "his/her", but they follow one rule that trips up almost every English speaker. In French, the possessive agrees with the thing owned, not with the owner, which is why "his sister" and "her sister" are both sa sœur. In this quick guide you will find the full table, that key difference from English, the vowel trick with mon/ton/son, real examples and the mistakes to avoid. If you want the bigger picture too, see our guide on how to learn French quickly.
Key takeaways:
- French possessive adjectives agree with the noun owned, not with the owner.
- “My” is mon (masc.), ma (fem.) or mes (plural).
- Son / sa / ses means both his and her — the object decides, not the person.
- Before a vowel sound, feminine nouns take mon, ton, son (mon amie, not ma amie).
- Notre, votre and leur have just two forms: singular and plural (nos, vos, leurs).
What Are French Possessive Adjectives?
Possessive adjectives are the words you put before a noun to show who owns it: my book, your car, her idea. In French, they work the same way in meaning, but with one twist that changes everything: they have to agree with the noun that follows them, in both gender and number.
That means the same idea of “my” can appear as three different words, depending on the noun: mon, ma or mes. Once you understand that logic, the whole system falls into place. Let’s look at the full picture first.
The Full Table of French Possessive Adjectives
Here are all the French possessive adjectives, organized by owner. Notice how each one has a masculine, a feminine and a plural form (except the last three):
| English | Masculine noun | Feminine noun | Plural noun |
|---|---|---|---|
| my | mon | ma | mes |
| your (tu) | ton | ta | tes |
| his / her / its | son | sa | ses |
| our | notre | notre | nos |
| your (vous) | votre | votre | vos |
| their | leur | leur | leurs |
Tip: the first three (mon, ton, son) each have three forms, but the last three (notre, votre, leur) only have two: one for the singular and one for the plural. That already cuts your workload in half.
The Big Difference from English: Agreement
This is the part that surprises every English speaker, so it is worth slowing down. In English, “his” and “her” tell you about the owner. In French, the possessive tells you about the thing owned.
So son, sa and ses all mean “his” and “her”. The word you pick depends only on the noun that comes next:
- son frère = his brother or her brother (frère is masculine)
- sa sœur = his sister or her sister (sœur is feminine)
- ses parents = his parents or her parents (plural)
Context tells you who the owner is. If you already know you are talking about Marie, then sa sœur clearly means “her sister”. Stop translating “his” and “her” directly, and instead look at the French noun to choose the right form.
Mon, Ton, Son Before a Vowel
There is one neat exception that actually makes life easier. When a feminine noun starts with a vowel or a silent “h”, you do not use ma, ta or sa. Instead, you switch to the masculine mon, ton, son, purely so the words flow better:
- mon amie (my friend, female) — not ma amie
- ton école (your school) — not ta école
- son histoire (his/her story) — not sa histoire
For example: you would say C’est mon adresse (“It’s my address”), even though adresse is feminine, simply because it starts with a vowel. The noun is still feminine; only the sound changes the choice.
Examples in Everyday French
Let’s see the possessives in action, the way you would really use them. Practicing them inside full sentences is far more effective than memorizing the table alone:
- Voici ma famille. — This is my family.
- Où sont tes clés ? — Where are your keys?
- Il aime son travail. — He likes his job.
- Nos amis arrivent demain. — Our friends arrive tomorrow.
- Ils ont vendu leur maison. — They sold their house.
To build more sentences like these, our list of useful French phrases gives you ready-made contexts where possessives pop up naturally. And since we love talking about our favorite things, our guide to colors in French pairs nicely with lines like ma couleur préférée (my favorite colour).
My tip as a French native speaker: don’t panic about masculine and feminine at first. Learn each possessive as part of a phrase you’ll actually say, like ma mère, mon père, mes amis. Your family and your everyday objects are the perfect starting point, because you repeat those words all the time. Say them out loud while pointing at real things around you, and the gender agreement stops feeling like a rule and starts feeling automatic.
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Common Mistakes to Avoid
Finally, here are the slip-ups that come up most often, so you can sidestep them from the start:
- Matching the owner instead of the noun: “her brother” is son frère, not sa frère. The brother is masculine, so son wins.
- Forgetting the vowel switch: it is mon erreur (my mistake), never ma erreur.
- Giving notre, votre and leur a feminine form: there isn’t one. Only the plural changes, to nos, vos and leurs.
Which of these tripped you up before? Drop your own example in the comments and we will check it together. And if you enjoy spotting patterns between the two languages, take a look at the surprising similarities between English and French to make the rest of your learning even smoother.
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