Make plural nouns in French by adding an s or x, or by substituting –aux for –al. In French grammar, here’s how you turn a singular noun into a plural noun:
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For most nouns, you add –s to the end. For example: résultat (result) becomes résultats (results); fleur (flower) becomes fleurs (flowers).
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Nouns that end in –eau and -eu take –x in the plural. For example: bateau (boat) becomes bateaux (boats), and manteau (overcoat) becomes manteaux (overcoats).
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Most nouns that end in –ou take –x in the plural. For example: chou (cabbage) becomes choux (cabbages), and bijou (jewel) becomes bijoux (jewels). But some take –s to make plural e.g. un clou (nail) becomes des clous (nails).
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Nouns that end in –al drop that ending and use –aux in the plural. For example: journal (newspaper) becomes journaux (newspapers); animal (animal) becomes animaux (animals). There are some exceptions e.g. un bal, un carnaval, un récital etc. which take an s to make plural.
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Nouns that end in –s, –x, or –z when they’re singular don’t change in the plural; you simply change the accompanying article. For example: un Français (a Frenchman) remains des Français (Frenchmen), and un nez (a nose) remains des nez (nose).