2. +S
singular plural
a car two cars
a cassette two cassettes
a lamp two lamps
a hat two hats
a cup two cups
a boy Two boys

3. +es after sibilants
singular plural
a box two boxes
a sandwich two sandwiches
a suitcase two suitcases
a rose two roses
a garage two garages

4. +ies substituting y after consonant
singular
a city
a lady plural
two cities
two ladies

5. + s / +ves after f
singular
a roof plural
a sheriff
a wife two roofs
a shelf two sheriffs
two wives
two shelves

6. +s / +es after o
singular
a disco plural
a piano
a potato two discos
a tomato two pianos
two potatoes
two tomatoes
buffalo - buffalos/buffaloes
mosquito - mosquitos/mosquitoes

7. Irregular
singular
plural
a man
two men
a woman
two women
a child
two children
a person
two people
a tooth two teeth
a foot Two feet
a mouse two mice