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IRREGULAR PLURALS LIST
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 -> EAUXSINGULAR | 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 | species |
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 |
OUSE -> ICE
SINGULAR | PLURAL |
louse | lice |
mouse | mice |

 
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Irregular Plural Nouns (Plurales irregulares)
Muchos sustantivos se pluralizan de un modo irregular. Existen dos casos:
1. Cuando el singular y plural no cambian.
* Ejemplos:* Singular
* Play
fish (pez o pescado)
* Play
sheep (oveja)
* Plural
* Play
fish (peces o pescados)
* fishes
* Play
sheep (ovejas)
* sheeps
2. Cuando el plural varía de modo irregular. Por lo tanto, no existe regla la cual se pueda seguir y hay que aprenderse las formas irregulares de cada uno.
Singular | Significado | Plural |Significado |
Playman | hombre | Playmen | hombres |
Playwoman | mujer | Playwomen | mujeres |
Playchild | niño | Playchildren | niños |
Playperson | persona | Playpeople | personas/gente |
Playtooth | diente | Playteeth | dientes |
Playfoot | pie | Playfeet | pies |
Playmouse | ratón | Playmice | ratones |

Examples Help! Definition and Meaning of Irregular Nouns
A noun is the name ofany person, place or thing as John, London or book. Just add an 's' to make most words plural - examples: cats, dogs, girls, bats. Just when you think plural words are simple along comes the phrase 'irregular nouns'! What exactly does this mean? What is an irregular noun? Most English nouns are very predictable ( or regular ) in the spelling of the plural form - you just add an 's' or 'es' whichmake 'regular' plural words. But there are always exceptions to the rule and these are referred to a 'irregular plural nouns! The meaning or definition of an irregular noun is as follows: |

|

  Definition & Meaning |
When irregular nouns change from their singular form to become plural, their spelling changes, in a different way to regular plural words, where cat, dog and book aremade plural by adding a letter 's' - cats, dogs, books etc. But it would be incorrect English to add an 's' or 'es' to 'irregular' words.The word 'mouse' changes to mice to indicate the plural
The word 'cactus' changes to cacti
The word scissors does not change at all to indicate the pluralIt would be incorrect English to add an 's' or 'es' to these 'irregular' words.The word 'diagnosis' changes...
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