为什么要做对我不利的事情呢
Why did you do the things that were harmful to me （已近做了）
或者
Why would you do the things if they were harmful to me?（假设）
对...不利：harmful to ... 为什么要做对我不利的事情呢
Why did you do the things that were harmful to me （已近做了）
或者
Why would you do the things if they were harmful to me?（假设）
对...不利：harmful to ...