<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div>A small point but perhaps more important given that you are trying to impress teachers:</div><div><br></div><div>its = the possessive form of it (i.e. belonging to it)</div><div>it's = the abbreviation of 'it is'.</div><div><br></div><div>John<br></div></div></body></html>