That man are hard working.把that man 换人称代词 是什么啊

上面那句有问题.
that man is hard working.代换 he.
those men are hard wording.代换they确定？确定！好吧 我再问一个可以不？行，你说Her brother is a sales reps. 还是her brother 换人称代词he额.........好吧 我怎么觉得不对啊怎么会不对？恩恩 好的 我知道了 谢谢啊~~~