What were you doing when your father came home?我是想如果是对（playing computer games)提问的话，那答案就应该是were doing，但是我认为答案应该是did do，不知以后如何解决这类问题。划线部分是什么时态，就用什么时态提问。eg.1.He played basketball yesterday afternoon.(对played basketball 提问) What did did he do yesterday afternoon?2.My brother will repair his bike tomorrow.(对will repair his bike 提问) What will your brother do tomorrow?希望对你有帮助，祝你开心。