Hola! There are a lot of different contractions in English. "Gonna" is informal for "going to", just like "want to" and "wanna". Among formal contractions you have: There is -> there's There are -> there're (although you rarely see it written this way) I am -> I'm He is -> he's She is -> she's It is -> it's (do not confuse with possessive "its") They are -> they're We are -> we're Are not -> aren't Is not -> isn't Could not -> couldn't Would not -> wouldn't Should not -> shouldn't Must not -> mustn't There are a bunch of others, especially those that depict how the words sound when spoken as opposed to correct spelling: Old -> ol' About -> 'bout Them -> 'em And -> an' I'm -> Ah'm