Hello,<br/>could you please help me?<br/><br/>If I haven't heard what sb has said or I haven't understood their words, should I say :<br/><br/><b>1. I am sorry? / Sorry?</b><br/><b>2. Excuse me? </b><br/><b>3. I beg your pardon? (this one is ok I think)</b><br/><br/>According to definitions of words, I think we should say 'excuse me' but I think I have heard people say 'Sorry?'<br/><br/>Thank you. <br/>Kind regards.