le mien, le tien, le sien
CEFR B1 · part 2
edumaterial's parts within the level. The European framework does not subdivide them.
on, the French way to be impersonalUsing on where your language uses a passive, and building the être passive only when it…After a preposition, the infinitiveUsing en + present participle for simultaneity, and an infinitive after any preposition.After si, never the futureBuilding all three conditional types, and never putting a future or conditional after si.Spoken French and written FrenchRecognising what is normal in speech but not in writing, and switching register without…celui, celle, ceux, cellesReplacing the noun without repeating it, and always following the pronoun with de, qui…en France, au Portugal, à ParisChoosing the preposition by the gender and number of the place, for going and for coming.The rule, in three lines
The possessive that replaces the noun instead of accompanying it: ce n'est pas mon livre, c'est le tien. It always keeps its article and agrees with the thing owned. And le sien covers both «his» and «hers», like son.
The usual slip. Dropping the article: «c'est mien». The possessive pronoun always keeps it: c'est le mien.
Why it catches you out. English says it's mine: one word, no article, no gender. French needs the article and two agreements —gender and number of the thing owned— and neither of those exists in your language.