写出下列单词的复数形式
fox- foxes fish- fishes horse-horses faily - failies class -classes wolf- wolves knife - knives bus - buses peach- beaches foot - feet woman- women child- children
2.写出下列单词的单数形式
houses - house oxen - ox mice - mouse are - is / am shelves - shelf ladies - lady potatoes- potato sheep - sheep( 单数与复数相同） snakes- snake deer- deer （单数与复数相同） teeth - tooth men- man
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