is it is its

Use is it when you're asking a direct question, and it's when you're telling something, because it's is just the short form of it is. - Asking your flatmate about the rota: Is it my turn to lock up? The question puts is first. - Answering or offering information: It's my turn. Here it's stands for it is, so it keeps normal statement order. - Contrasting the two side by side: Is it open? versus It's open. Same words, but the question flips them and the statement doesn't. Watch out for reported questions. When you report what someone asked rather than asking it yourself, the wording follows statement order, so it's stays: She asked if it's open on Sundays. No inversion happens there, even though the meaning is a question, because the sentence as a whole is telling something, not asking.