man – men………… child – children …………mouse – mice………… tooth-teeth

woman – women …………ox – oxen………… die – dice …………foot – feet

Words ending with “o”

-s

auto – autos …………photo – photos …………zoo – zoos …………video – videos

kilo - kilos………… radio – radios …………piano – pianos …………tattoo – tatoos

-es

potato – potatoes …………tomato – tomatoes …………hero – heroes………… echo – echoes

both -es and -s

zero – zeroes/zeros …………volcano – volcanoes / volcanos

tornado – tornadoes / tornados …………mosquito – mosquitoes / mosquitos

-f and – fe ending words become –ves :

wife – wives………… knife- knives …………wolf – wolves …………thief – thieves

life – lives………… loaf – loaves………… leaf – leaves …………shelf – shelves

scarf – scarves

Some don’t change

roof – roofs cliff – cliffs belief – beliefs chief - chiefs

The words whose singular and plural forms are the same

deer fish means series sheep species

Latin Words

criterion – criteria ………… crisis – crises …………datum – data

phenomenon – phenomena………… thesis – theses …………medium – media

bacterium - bacteria …………oasis – oases………… curriculum – curricula

formula – formulas / formulae

index – indices / indexes