Donot be()Mr.Going-to-do!

Donot be()Mr.Going-to-do! Don't be another Mr.Going To Do!为什么这里用be?是什么用法? don't be another Mr Going to 英语阅读题.Mr Going-to-do be going to do sth be going to do问句 be going to do 后跟 be going to和be going to do的区别? I donot know --------to do it. be to do和be going to do的区别 初二完型题：Don't be （another） ‘Mr.Going-to-do’”.括号里能不能写成like?为什么 be to do,be going to do,will do,be about to do的区别.