题目内容
17．Can you help me divide the cake into twohalves （半）？分析 你能帮我讲蛋糕分成两半吗？
解答 答案：halves．结合句意和所给的中文含义得出是将蛋糕分成两半，一半half，two是数词"二"，后加名词复数，half的复数是halves，故答案是halves．
点评 名词单数变复数的规则：
1．在单词后面加"s"，
如：an officer-officers a tourist-tourists a passport-passports
2．在以"s""x""sh""ch""o"结尾的单数名词变复数时，需要后面加"es"如：a bus-buses a box-boxes a fish-fishes
3．以元音字母加"y"结尾的单数名词变复数，我们在词尾加"s"如：a boy-boys a key-keys a play-plays
4．以辅音字母加"y"结尾的单词，需把y改为i再加es 如：a fly-flies a baby-babies a family-families
5．当单数名词的结尾是"f"或"fe"时，将f，fe改为v，再加es 如：a housewife-housewives life-lives
6．特殊的，man-men child-children sheep-sheep
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