Good question! Let me give you some general rules, but please remember there will be exceptions! All nouns capable of taking a plural end in -s, except the following: Nouns that end in -s, ss, sh, ch, x, o bus - buses kiss - kisses brush - brushes church - churches fox - foxes potato - potatoes [exceptions: photos, kilos, videos] Nouns that end in a consonant + y: baby - babies lady - ladies daddy - daddies Nouns that end in f / fe: knife - knives [you can obviously hear the change in pronunciation here] leaf - leaves exceptions: roof roofs / handkerchief handkerchiefs All irregular plurals: man men woman women child children ox oxen louse lice mouse mice foot feet tooth teeth goose geese There are certain words that never take plural endings [uncountable nouns: information etc]; nouns which are used in the plural only [scissors] and words which take the same singular and plural [deer].