他问我：“你把你弟弟留在这里就是为了找那只鞋吗？如果你回来的时候他不见了，你怎么办？”

He asked me, "You are leaving your brother here to find the shoe? What will you do if he is not here when you return?"

youdao

如果你回来了，一定要告诉我。

You must tell me if you come back.

youdao

如果你回来得晚，那么我就不等你了。

If you come back late, I will not wait for you.

youdao

You can't say quite as much if you've only been in France for a couple of days before coming back, but still you can say something relevant.

如果你只是去法国待了几天就回来的话,的确没有多少可说的,但是你仍然可以说出一些相关的东西

耶鲁公开课 - 死亡课程节选