b) box – boxes                 church – churches       brush – brushes           class - classes         buzz – buzzes

c) baby – babies               party – parties     city – cities                    poppy – poppies

d)man-men

foot-feet

tooth-teeth

child-children

e) echo – echoes                          potato – potatoes

    hero – heroes                            tomato – tomatoes

Some nouns have the same singular and plural form.

k) criterion – criteria phenomenon- phenomena

l) cactus – cacti/ cactuses nucleus – nuclei
fungus- fungi stimulus – stimuli
syllabus- syllabi/ syllabuses

m) formula – formulae/ formulas
vertebra – vertebrae

n) appendix – appendices/ appendixes
index- indices/ indexes

o) analysis – analyses basis – bases
crisis – crises hypothesis- hypotheses
oasis – oases thesis- theses
parenthesis – parentheses

p) bacterium – bacteria curriculum – curricula
datum – data medium – media
memorandum – memoranda
Some nouns that English has borrowed from other languages have foreign plurals