you need to finish your homework before playing outside=You can play outside

题目

you need to finish your homework before playing outside=You can play outside
_____ _____your homework.

答案

填： after finishing . after 是介词,所以 finishi要加 ing.

在你出去玩之前必须完成你的作业.= 你可以在写完作业之后出去玩.