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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