Make sure you must close all the windows. 请问，这句话有什么错误？

去掉must就对了,make sure本身就是"确定,确保"的意思,在加上must句子的意思有重复,而且语法上也没有必要

make sure的用法:
make sure that+从句

Make Sure 和Must 意思有重复
Make sure you close all the windows.
You must close all the windows.
不过 Must的语气有点强 听 起来不太好

make sure that you will close all the windows

Make sure you close all the windows.
不需 must