-'s-'s1 /z, s/1the short form of ‘is’: John’s here. What’s that? She’s writing a letter.2the short form of ‘has’: Polly’s gone out. A spider’s got eight legs.3a 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?
-'s1-'s2suffix
-'s-'s2 suffix1forms 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 bedroom2British 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).