Hi,<br/><br/>Can anyone help me with the questions:<br/><br/>1) Why are you not happy?<br/><br/> Why aren't you happy?<br/><br/><i>Which one is more common? </i><br/><br/>2) Why do you not go to the concert?<br/><br/> Why don't you go to the concert?<br/><br/><i>Again, which one is more common?</i><br/><br/>Thanks very much.<br/><br/>Stephen