Study these groups of words to learn how they change to plural.
Each group of words has similar changes.
US -> I
| SINGULAR | PLURAL |
| alumnus | alumni |
| cactus | cacti |
| focus | foci/focuses |
| fungus | fungi/funguses |
| nucleus | nuclei |
| radius | radii |
| stimulus | stimuli |
IS -> ES
| SINGULAR | PLURAL |
| axis | axes |
| analysis | analyses |
| basis | bases |
| crisis | crises |
| diagnosis | diagnoses |
| ellipsis | ellipses |
| hypothesis | hypotheses |
| oasis | oases |
| paralysis | paralyses |
| parenthesis | parentheses |
| synthesis | syntheses |
| synopsis | synopses |
| thesis | theses |
IX -> ICES
| SINGULAR | PLURAL |
| appendix | appendices |
| index | indeces/indexes |
| matrix | matrices/matrixes |
EAU -> EAUX
| SINGULAR | PLURAL |
| beau | beaux |
| bureau | bureaus/bureaux |
| tableau | tableaux/tableaus |
*** -> EN
| SINGULAR | PLURAL |
| child | children |
| man | men |
| ox | oxen |
| woman | women |
*** -> A
| SINGULAR | PLURAL |
| bacterium | bacteria |
| corpus | corpora |
| criterion | criteria |
| curriculum | curricula |
| datum | data |
| genus | genera |
| medium | media |
| memorandum | memoranda |
| phenomenon | phenomena |
| stratum | strata |
NO CHANGE
| SINGULAR | PLURAL |
| deer | deer |
| fish | fish |
| means | means |
| offspring | offspring |
| series | series |
| sheep | sheep |
| species | specie |
OO -> EE
| SINGULAR | PLURAL |
| foot | feet |
| goose | geese |
| tooth | teeth |
A -> AE
| SINGULAR | PLURAL |
| antenna | antennae/antennas |
| formula | formulae/formulas |
| nebula | nebulae |
| vertebra | vertebrae |
| vita | vitae |
F, FE -> VES
SINGULAR PLURAL
CALF CALVES
DWARF DWARVES
ELF ELVES
LOAF LOAVES
SCARF SCARVES
SHELF SHELVES
THIEF THIEVES
WHARF WHARVES
LEAF LEAVES
HOOF HOOVES
WOLF WOLVES
KNIFE KNIVES
LIFE LIVES
WIFE WIVES
OUSE -> ICE
| SINGULAR | PLURAL |
| louse | lice |
| mouse | mice |
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