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Nouns: Gender & Number·Forming Plurals: -o → -i
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Rule reminder

Masculine nouns ending in -o form their plural by changing -o to -i: libro → libri, gatto → gatti.

Forming Plurals: -o → -i1 / 10

What is the plural of 'libro' (book)?

More in this section

→ Forming Plurals: -a → -e→ Forming Plurals: -e → -i→ Singular to Plural: Article + Noun→ Plurals: Mixed Endings
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