the english homework must be handed in by the weekend （改为一般疑问句）说明理由

Must the English homework be handed in by the weekend?
该一般疑问句的规则是把句子中的助动词提前到句首,就是must提前,即可.为什么不是be 提到前面呢？因为要按顺序来呀，把第一个助动词提前，must在前呀。