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Listen in on the rival bands setting up for the school talent show. Select ALL the grammatically correct complaints they make.
The correct answers are Our drummer is much louder than theirs! and They forgot their guitars, so they want to borrow ours.
Our and their are possessive adjectives that must come right before a noun (like "drummer" and "guitars").
Ours and theirs are possessive pronouns that replace a noun phrase. Saying "is their" is incorrect because we need the pronoun theirs. Saying "Ours singer" is incorrect because we need the adjective Our.