Possessive adjectives (my, your, his/her) in French must agree in gender (masculine/feminine) and number (singular/plural) with the noun they modify, not the person who owns the object.
For singular possession, the forms change based on the noun's gender: mon/ma (my), ton/ta (your), and son/sa (his/her). If the noun is plural, the forms become mes, tes, and ses regardless of gender.
For plural owners (our, your, their), the forms are notre/nos, votre/vos, and leur/leurs. These forms only change based on whether the possessed noun is singular or plural, not its gender.
A critical phonetic rule occurs when a feminine singular noun begins with a vowel or a silent h. In these cases, the masculine possessive adjective (mon, ton, son) is used instead of the feminine form (ma, ta, sa).
This rule exists to prevent a 'hiatus'—the awkward pause or glottal stop created by two vowel sounds clashing (e.g., ma amie becomes mon amie).
This substitution is purely phonetic and does not change the grammatical gender of the noun itself; it is a strategy for maintaining the characteristic flow of the French language.
The silent final 'e' is a hallmark of French pronunciation; if a word ends in an unaccented 'e', that letter is not voiced, though it often causes the preceding consonant to be pronounced.
In very short monosyllabic words like je, te, or me, the 'e' is pronounced as a soft, neutral schwa sound, which is distinct from the silent 'e' in longer words.
The vowel combinations [eu] and [œu] typically produce an 'open' sound in words related to family and friends, requiring a specific mouth shape that is more open than the English 'er' sound.
The letter 'o' in words like notre and votre is also an open vowel sound, which differs from the 'closed' o sound found in other French contexts.
When writing or speaking about family, always verify the gender of the noun before selecting a possessive adjective. A common mistake is matching the adjective to the speaker's gender rather than the object's gender.
Pay close attention to the plural 's' on possessive adjectives like mes, tes, and ses. While the 's' is often silent in speech, it is mandatory in writing and may trigger a liaison (pronouncing the 's' as a 'z' sound) if the next word starts with a vowel.
Distinguish clearly between son/sa/ses (his/her/its) and leur/leurs (their). Students often confuse these because English uses 'their' for both singular and plural objects, whereas French distinguishes based on the number of objects owned.