Why are you doing that?你干吗要干那种事

"今天的几个句子是有关制止的：1.Hold it! It's time for lunch. 别干了，该吃午饭了。2.It's about time. 总算到点了。Get your hands off me! 拿开你的手。3.Don't touch me! 别碰我!4.Keep it out of sight. 要做得不露痕迹。"