How do I know when to put An Apostrophe in it's?The word it's is always short for it is (as in it's raining) or in informal speech. For it has (as in it's got six legs). The word its means belonging to it (as in hold its head still while I jump on its back). It is a possessive pronoun like his.Related Links:• How do I know when to put An Apostrophe in it's?• Is it an hour or a hour?• It is raining. Can this sentence stand alone as grammatically correct?• Is the word Data singular or plural?• Is the word Agenda singular or plural?• Is it acceptable to use THEY instead of HE or SHE? • Should I use A Singular or A Plural Verb with Collective Nouns?• Should I write : A Number of People is or A Number of People are?• What are the Plurals of octopus, hippopotamus and syllabus?• What is a Split Infinitive and why should I avoid using one?• The Word for The Whole that is Greater than the sum of the parts is ...• When should I use LESS and when should I use FEWER? • Which is correct : a European not an European? • Which is correct in this sentence : Lay or Lie? • Which is correct: My Friend and Me or my friend and I?• Which is the correct spelling : Oriented or Orientated?