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For example, which is correct:

The robot can then compute it's coordinates.


The robot can then compute its coordinates.

What's the rule here? It seems a little inconsistent.

marked as duplicate by Janus Bahs Jacquet, Mr. Shiny and New 安宇, Hellion, FumbleFingers, Ronan Apr 7 '15 at 13:00

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  • The more common pronouns are exempt from using an apostrophe to denote possession, since the apostrophe is needed to denote contraction, and since the pronouns never append "s" to make a plural. – Hot Licks Apr 7 '15 at 12:41
  • "Its" as a possessive is a special case, and definitely is not consistent with normal apostrophe rules. – Jeremy Nottingham Apr 7 '15 at 12:52

Apostrophe-S is used to form the possessive for nouns only.

All possessive pronouns are not apostrophized:

  • his
  • hers
  • its
  • mine
  • yours
  • theirs
  • ours
  • Most possessive pronouns are not apostrophised. One needs to be careful with one's assertions. – Edwin Ashworth Apr 7 '15 at 14:49

"it's" is a major grammatical mistake here


The robot can then compute its [own?] coordinates.

"Own" is necessary if these are robot's own coordinates.

  • Good point about "own" – user1636130 Apr 7 '15 at 13:03

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