-'s
Longman Dictionary of Contemporary English 5++LDOCE 5++-'s1 /z, s/1 XXthe short form of ‘is’ / ‘is’ 的缩略式 John’s here. 约翰在这儿。 What’s that? 那是什么？ She’s writing a letter. 她在写信。2 XXthe short form of ‘has’ / ‘has’ 的缩略式 Polly’s gone out. 波莉出去了。 A spider’s got eight legs. 蜘蛛有八条腿。3. XXa short form of ‘us’ used only in ‘let’s’ / ‘us’ 的缩略式，〔仅用于let’s〕4 XX spoken a short form of ‘does’, used in questions after ‘who’, ‘what’ etc that many people think is incorrect / ‘does’ 的缩略式，〔用于疑问句中的 who，what 等词后，但许多人认为这种用法不正确〕 How’s he plan to do that? 他打算怎样去做那件事？-'s2 suffix1 XXforms the possessive of singular nouns, and of plural nouns that do not end in -s 〔构成单数名词和非-s结尾的复数名词的所有格〕 my sister’s husband 我的妹[姐]夫 Mary’s generosity 玛丽的慷慨 yesterday’s lesson 昨天的课 the children’s bedroom 孩子们的卧室2 British EnglishXX the shop or home of someone 〔某人的〕店，家 I bought it at the baker’s (=at the baker’s shop). 这是我在面包店买的。 I met him at Mary’s (=at Mary’s house). 我是在玛丽家遇见他的。
-'s1-'s2 suffixChinese
-'s
-'s1 /z, s/ 
1. the short form of ‘is’:
John’s here.
What’s that?
She’s writing a letter.
2. the short form of ‘has’:
Polly’s gone out.
A spider’s got eight legs.
3. a short form of ‘us’ used only in ‘let’s’
4. spoken a short form of ‘does’, used in questions after ‘who’,‘what’ etc that many people think is incorrect:
How’s he plan to do that?
-'s2
suffix
1. forms the possessive of singular nouns, and of plural nouns that do not end in -s:
my sister’s husband
Mary’s generosity
yesterday’s lesson
the children’s bedroom
2. British English the shop or home of someone:
I bought it at the baker’s (=at the baker’s shop).
I met him at Mary’s (=at Mary’s house).
| I |
1. the short form of ‘is’:
2. the short form of ‘has’:
3. a short form of ‘us’ used only in ‘let’s’
4. spoken a short form of ‘does’, used in questions after ‘who’,‘what’ etc that many people think is incorrect:
| II |
suffix1. forms the possessive of singular nouns, and of plural nouns that do not end in -s:
2. British English the shop or home of someone: