yes, it is 因为这里的主语是指示代词that, 而不是he.
That 在这里就是代指哥哥 相当于 Is he your brother？肯定回答 Yes,he is 否定回答 No,he isn't纯手打 望采纳！！
yes he is 确定一定以及肯定
按人称一致原则,yes, he is
Yes, he is.
