Collins Cobuild English Grammar (185 page)

However, the following nouns ending in
o
have plurals ending in
oes
:

domino

echo

embargo

hero

negro

potato

tomato

veto

The following nouns ending in
o
have plurals that can end in either
s
or
es
:

buffalo

cargo

flamingo

fresco

ghetto

innuendo

mango

manifesto

memento

mosquito

motto

salvo

stiletto

tornado

torpedo

volcano

R12
    The following nouns in English have special plural forms, usually with different vowel sounds from their singular forms:

child		children
foot		feet
goose		geese
louse		lice
man		men
mouse		mice
ox		oxen
tooth		teeth
woman		women

R13
    Most nouns that refer to people and that end with
man
,
woman
, or
child
have plural forms ending with
men
,
women
, or
children
.

postman		postmen
Englishwoman		Englishwomen
grandchild		grandchildren