-'s /s/ after /p/ /t/ /k/ /f/ or /θ/ /əz/ after /s/ /z/ /ʃ/ /ʒ/ /tʃ/ or /ʤ/ /z/ elsewhere noun suffix or pronoun suffix
-'s
/s/ after /p/ /t/ /k/ /f/ or /θ/ /əz/ after /s/ /z/ /ʃ/ /ʒ/ /tʃ/ or /ʤ/ /z/ elsewhere
noun suffix or pronoun suffix
Learner's definition of -'S
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used to form the possessive of singular nouns, of plural nouns not ending in s, of some pronouns, and of word groups that function as nouns or pronouns用于构成单数名词、不以s结尾的复数名词、某些代词，以及起名词或代词作用的词组的所有格 -
The boy's books were missing.这个男孩的书都不见了。
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I called the doctor's (office).我往医生办公室打了电话。
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children's clothes童装
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anyone's dog任何人的狗
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the man on the corner's hat站在拐角那个男子的帽子
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someone else's car别人的车
◊ The possessive of a plural noun that ends in s is formed by adding an apostrophe alone instead of 's.以s结尾的复数名词的所有格只在其后加撇号，而非加's。
◊ The possessive of singular nouns and names that end in s can usually be formed by adding 's. If adding 's would make the word difficult to say, an apostrophe alone may be used instead.以s结尾的单数名词和姓名的所有格通常可以在其后加’s；如果加’s会造成发音困难，也可以只加撇号替代。
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James's mother詹姆斯的母亲
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Moses' mother摩西的母亲