In most cases, you use the possessive adjectives ma, ta, or sa with a feminine noun (ma valise, ma petite sœur). See Mon, ma, mes; ton, ta, tes; son, sa, ses = my; your; his / her in French (possessive adjectives)
HOWEVER, you need to know two things:
1. The possessive adjective's ending is always determined by the word directly following it.
2. You never use ma, ta, sa in front of a word starting with a vowel or mute h, even if the related noun is feminine: you use mon, ton, son instead, to ease pronunciation.
Here are the different contexts where this rule matters:
mon / ton / son + feminine noun starting with a vowel/mute h
mon ami Thomas et mon amie Sarahmy friend Thomas and my friend Sarah
Mon aventure est une aventure passionnante.My adventure is an exciting adventure.
J'ai une horloge qui est plus grande que ton horloge.I have a clock which is bigger than your clock.
Son opinion est une opinion intéressante.His opinion is an interesting opinion.
When ma, ta, sa is followed directly by a feminine noun starting with a vowel or mute h, it becomes mon, ton, son.
ma / ta / sa + adjective starting with a consonant + feminine noun starting with a vowel/mute h
C'est ton amie ? - Non, c'est ma petite amie.She is your friend? - No, she is my girlfriend.
Il se souvient de son enfance, sa belle enfance.He remembers his childhood, his beautiful childhood.
C'est mon hypothèse. - Oui, ta mauvaise hypothèse !That's my hypothesis. - Yes, your bad hypothesis!
If ma, ta, sa is followed directly by an adjective starting with a consonant, even if the related feminine noun starts with a vowel or mute h, it remains ma, ta, sa.
mon / ton / son + adjective starting with a vowel/mute h + feminine noun
J'ai goûté ton excellente tarte aux pommes !I tried your excellent apple tart!
Tu as rencontré mon horrible tante ?Have you met my horrible aunt?
Tu as vu son énorme verrue?Did you see her huge wart?
If ma, ta, sa is followed directly by an adjective starting with a vowel or mute h, even if the related feminine noun starts with a consonant, it becomes mon, ton, son.
More Possessive Adjectives
Notre/nos/votre/vos/leur/leurs = our/your/their (French Possessive Adjectives)
and also the more advanced
Common mistakes with mon/ma/mes, ton/ta/tes and son/sa/ses (French Possessive Adjectives)
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