" This is not fully a part of standard English. To denote possession, as in "my brother's wife". org/wiki/Apostrophe#Possessive_apostrophe ) In extremely limited cases, when there is no viable alternative, to denote the plural of an abbreviation or other "non-word", as in "This word contains three i's".
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AnonymousWhen do we use a APOSTROPHE 's after a word?As explained above, but when forming the possessive, use it after all singular nouns and after plurals that do not end in s.