TL;DR only use the apostrophe when you're saying "it is" or "it has". "Its" is possessive even without the apostrophe. More: http://www.quickanddirtytips.com/e

TL;DR only use the apostrophe when you're saying "it is" or "it has". "Its" is possessive even without the apostrophe. More: http://www.quickanddirtytips.com/education/grammar/apostrophe-catastrophe-part-one http://www.quickanddirtytips.com/education/grammar/apostroph...