's - Apostrophe, genitive -s, possessive -s

Exercise - Apostrophe 's

English: German:
Ronny's brother Ronnys Bruder and
Ronny's Bruder (since spelling reform)


Add 's:

Mandy's brother John plays football.
My teacher's name is ...


Add the apostrophe ' to regular plural forms:

The girls' room is very nice.
The Smiths' car is black.

Add 's to irregular plural forms:

The children's books are over there.
Men's clothes are on the third floor.

Singular names ending in -s

Although it is not considered to be good English, you may add only the apostrophe words ending on unpronounced -s

Charles's dog – Charles' dog

Illinois's capital – Illinois' capital

Words ending in -x and -z follow the same rules.

Felix's car – Felix' car

But there are situations where only 's is the best choice to make the meaning clear.


If there are multiple nouns that refer to one person/thing – add an 's to the last noun.
Peter and John's mother is a teacher.

If there are multiple nouns that refer to more persons/things – add 's to both nouns.
Susan's and Steve's bags are black.

Thanks to Karin and Robert.

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