|A lot of people have trouble knowing when to use its and when to use it's. It's is a contraction for it is or it has. Its is a possessive pronoun meaning of it or belonging to it. If you aren't sure which one to use, try replacing it with it is. If that makes sense, use it's. If not, try replacing it with her or his. If that makes sense, then use its. Choose the correct word for the blank space in each sentence.