Mon, ma, mes: how to say ‘my’ in French

Mon, ma and mes all mean “my”. French has three words for one English word because the possessive agrees with the thing owned, not with you. Use mon before a masculine singular noun, ma before a feminine singular noun, and mes before any plural noun. Mon frère (“my brother”), ma sœur (“my sister”), mes parents (“my parents”) — the owner is the same “I” in all three; only the noun changes the word.

The choice depends on the noun, not on you

This is the rule that surprises English speakers. In English, “my” never changes. In French, you look at the gender and number of the noun that follows, so the same idea (“my”) takes three shapes. The noun’s gender is the thing to know, which is why this builds straight on le vs la and noun gender.

Mon livre, ma table, mes clés.
My book, my table, my keys.

Use mon before a feminine word starting with a vowel

There is one neat exception. To avoid two vowel sounds clashing, French uses mon (not ma) before a feminine noun that begins with a vowel or a silent h — purely for sound.

mon amie, mon école, mon histoire
my friend (f), my school, my story

So amie is feminine, but you still say mon amie because ma amie would be hard to pronounce. The same applies to ton/son: ton amie, son école.

The rest of the family: ton, son, notre, votre, leur

Mon/ma/mes is one row of a larger table. The other persons follow the same logic — agree with the owned noun — except notre/votre/leur, which have just one singular form for both genders.

The tricky one is son/sa/ses: it means “his”, “her” or “its” — the form depends on the object, not the owner. Son livre is “his/her book” (livre is masculine); sa voiture is “his/her car” (voiture is feminine).

Common mistakes

Saying “ma amie”

Before a feminine word starting with a vowel, use mon for sound.

ma amie / ma école → mon amie / mon école
my friend / my school

Matching the possessive to the owner

Son and sa agree with the thing owned, not with “he” or “she”. “Her brother” is son frère because frère is masculine.

sa frère (for “her brother”) → son frère
her brother

Using mes for a singular noun

Mes is plural only. For one thing, use mon or ma.

mes voiture → ma voiture
my car

Because the whole system rests on the gender of the noun, the fastest way to make mon/ma feel automatic is to be sure of un vs une first. In Fluera you choose the possessive inside short sentences about real things — your family, your keys, your room — and hear the agreement, so picking mon, ma or mes becomes a reflex. Try it when you practice French.

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