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Study
Studeo 3, singular and plural forms
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a species
species
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a spy
spies
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a piece of advice
advice
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tooth
teeth
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a post office
post offices
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a Chinese
Chinese
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an aircraft
aircraft
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a toothbrush
toothbrushes
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a father-in-law
fathers-in-law
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a salmon
salmon
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a crossroads
crossroads
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a mouse
mice
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a knife
knives
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a wife
wives
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a phenomenon
phenomena
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a reindeer
reindeer
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a belief
beliefs
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a piano
pianos
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a piece of furniture
furniture
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a goose
geese
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