What must I do 与What must do 有什么不同?

what must i do? how must i do和what must i do有什么区别 英语达人进!救救我!you must do as i do和you must do what i say 有什么不同"前 what must i do和what should i do 有什么区别 what must do 与 what must I do 可以交换吗? what must he do? what must I do正确吗 What I must do is study hard. What must she do 有没有语法错误 What I must do ,what should I do ,what I can do ,I need the 请教what must they do You must do exactly what I tell you to do