Plural Nouns

Most nouns add -s in the plural: book → books, friend → friends, key → keys.

• After -s, -sh, -ch, -x add -es: bus → buses, dish → dishes, watch → watches, box → boxes.
• Some nouns in -o add -es: tomato → tomatoes, potato → potatoes, but photo → photos.
• Consonant + y becomes -ies: city → cities, baby → babies. After a vowel, just add -s: day → days.
• Many nouns in -f/-fe change to -ves: knife → knives, leaf → leaves, half → halves.
• Irregular plurals have to be learned: child → children, man → men, woman → women, person → people, foot → feet, tooth → teeth, mouse → mice.
• Some nouns stay the same: sheep → sheep, fish → fish.