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that IS the plural
mine - ours (The computer not only belongs to me, it belongs to both of us. It is ours.)
our - ours (That is not our assignment. These assignments are not ours.)
No, ours does not need an apostrophe (ever).
The piano at the church had been ours.
Singular form:
ours polaire
ours blanc
Plural form:
ours polaires
ours blancs
Ours. For example that car is ours.
We are doing the action of completing the choice. It is ours whether its ours by will or ours by force.