In French, to express something belongs to someone you can use the expression "être à".
How to use 'être à' in French
Look at these sentences expressing possession:
Cette ceinture est à eux.This belt is theirs. (a mixed group or male group) C'est à qui? / À qui c'est?Whose is it? Ce sac est à lui.This bag is his. Ces chaussures sont à elle.These shoes are hers. Ces bonbons sont à elles.These sweets are theirs (female group).
To express possession in French (It's mine, yours...), you can use the expression être à + moi/toi/lui/elle/nous/vous/eux/elles (literally it is to me/you/...)
Grammar note: in French you use the disjunctive/stress pronouns (moi/toi/lui/elle ...), whereas in English you use the possessive pronouns (mine/yours/his/hers ....)
See also Le mien/le tien/le sien/etc = Mine/yours/his/hers/its (French Possessive Pronouns)
and Le nôtre/le vôtre/le leur/etc = Ours/yours/theirs (French Possessive Pronouns)
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