If the word is singular then you put the apostrophe before the s. If it is plural then put it after the s. A word does no have a apostrophe in the possessive if it is a pronoun, example: his or hers.
Apostrophes are used to indicate possession:
E.g. 'The dog's bone' = 'the bone which belongs to the dog'(except in his, hers, ours, yours (but including one's))Apostrophes are also used to show a...
An apostrophe followed by the letter s at the end of a noun signifies possessive case. The mark followed by an s also pluralizes letters of the alphabet, figures, and words discussed as words. Within...