The same Singular and Plural: species, means, series, fish, sheep, deer, Irregular plural: mouse, goose, person, ox, tooth, man, child, Plural only: scissors, trousers, tights, jeans, police, pyjamas, - ves: leaf, life, knife, wolf, - es: potato, wish, glass, watch, - s: piano, pen, holiday, roof, belief, -ies: puppy, city, charity,

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