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,sh, ch or x + es a glass—glasses a watchwatchesNouns ending in o+s or +es a piano—pianos a mango—mangoesNouns ending in for fe f or fe +ves a knife –knives a shelfshelves(單復(fù)數(shù)不變)bread, rice, water ,juice等。I’m= I a, you’re = you are, she’s= she is, he’s = he isit’s= it is, who’s =who is, can’t =can not, isn’t=is n