In the possessive form, if the noun is plural, or already ends in -s , just add: ' (an apostrophe). g. the girls' room.
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AnonymousDoes it stand for my parents their permission but I can not write parents's ? (theirs) If so, how does one explain the 10 years' time ? I hope someone can explain this to me.Just wanted to add: you may also find some words ending with -s followed by the 's.