Hello.<br/><br/>What's going to be a correct usage of who/whom?<br/><br/><i>A:Today we're to kill all the people.</i><br/><br/><i>B: Kill who/whom?</i><br/><br/><i>A: He was shot down.</i><br/><br/><i>B: By who/whom?</i><br/><br/>Thanks so much in advance.