What do you do if someone gives you something, then they tell you they want it back?
What is a person supposed to do if they are given something and then told to return it?
この場合、次のように言うと良いかなと思います。
ーWhat do you do if someone gives you something, then they tell you they want it back?
「誰かに何かをもらったのに、返せって言われたらどうする?」
ーWhat is a person supposed to do if they are given something and then told to return it?
「何かもらったのに返せって言われても、どうしろってんだ?」
ご参考まで!