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Countable Nouns - Irregular Plurals

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SINGULAR
PLURAL
alumnus alumni
analysis analyses
antenna antennae/antennas
appendix appendices
axis axes
bacterium bacteria
basis bases
beau beaux
bureau bureaux/bureaus
child children
corpus corpora/corpuses
crisis crises
criterion criteria
curriculum curricula
datum data
deer deer
diagnosis diagnoses
ellipsis ellipses
fish fish
focus foci/focuses
foot feet
formula formulae/formulas
fungus fungi/funguses
genus genera
goose geese
hypothesis hypotheses
index indices/indexes
louse lice
man men
matrix matrices
means means
medium media
mouse mice
nebula nebulae
nucleus nuclei
oasis oases
ox oxen
paralysis paralyses
parenthesis parentheses
phenomenon phenomena
radius radii
series series
sheep sheep
species species
stimulus stimuli
stratum strata
synthesis syntheses
synopsis synopses
tableau tableaux
thesis theses
tooth teeth
vertebra vertebrae
vita vitae
woman women

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