A
fish
fish
potato
potatoes
Add -es
thesis
theses
Change -is to -es
loaf
loaves
Change f to v
then
Add -es
crisis
crises
Change -is to -es
feet
wolf
wolves
Change f to v
then
Add -es
curriculum
curricula
nucleus
nuclei
wife
wives
Change f to v
then
Add -s
bird
birds
cactus
cacti
Change -us to -i
life
lives
Change f to v
then
Add -s
mouse
mice
goose
geese
shark
sharks
analysis
analyses
Change -is to -es
women
child
children
tooth
teeth
knife
knives
Change f to v
then
Add -s
volcano
volcanoes
focus
foci
Change -us to -i
half
halves
Change f to v
then
Add -es
tomato
tomatoes
Add -es