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What the Teacher Needs to Know about More Plurals
(Description – 179, Word Lists – p. 278)
Many of the Latin-based words form plurals in ways other than the traditional addition of
s or es. Examples are crisis/crises, bacterium/bacteria, persona/personae, and
radius/radii. Many of these words also have another acceptable plural form that involves
simply adding s or es. Scientific terminology is often involved in words that form plurals
in these ways. When students are working at the derivational constancy stage, they are
ready to learn about these plural forms.
More Plurals Sort 1a
analysis
analyses
alga
algae
formula
formulae
basis
bases
crisis
crises
formulas
pupa
pupae
diagnosis
diagnoses
pupas
analysis
formula
basis
pupa
diagnosis
analyses
formulae
bases
pupae
diagnoses
alga
formulas
crisis
pupas
algae
crises
More Plurals Sort 1a
sis to ses
analysis/analyses
basis/bases
crisis/crises
diagnosis/diagnoses
a to ae (also add s)
alga/algae
formula/formulae/formulas
pupa/pupae/pupas
Transfer Words: emphasis/emphases, alumna, alumnae
More Plurals Sort 2a
alumnus
alumni
addendum
addenda
curriculum
curricula
curriculums
focus
foci
focuses
hippopotamus hippopotami
hippopotamuses
stimulus
stimuli
memorandum
memoranda
memorandums
alumnus
alumni
curriculum
curricula
foci
focuses
stimulus
stimuli
memorandums
addendum
addenda
curriculums focus
hippopotamus hippopotami
memorandum memoranda
hippopotamuses
More Plurals Sort 2a
us to i (also add es)
alumnus/alumni
focus/foci/focuses
hippopotamus/hippopotami/
hippopotamuses
stimulus/stimuli
um to a (also add s)
addendum/addenda
curriculum/curricula/curriculums
memorandum/memoranda/
memorandums
Transfer Words: fungus/fungi/funguses, datum/data