This worksheet defines 'its' as a possessive pronoun and 'it's' as a contraction for 'it is'. It then provides 15 sentences based on Itsy the Iguana, where learners will have to fill in the correct 'its' or 'it's'.

The confusion between "it's" and "its" primarily arises because, generally, an apostrophe indicates possession in English. For example, "John's book" means the book belonging to John. So, when it comes to "its" (a possessive term), kids might instinctively want to put an apostrophe in there because that's the rule they've learned. However, "its" is an exception to that rule, which can make it confusing.