要。
must 后跟动词原形;其否定式是mustn't;其疑问句式是把must 提前到主语前面。
must 开头的一般疑问句做肯定回答时,用Yes, ... must. ;否定回答时,用No, ... needn’t/don’t have to。
特殊疑问句的基本结构
1、特殊疑问词+助动词+主语+实义动词+其他?例如:What can I do for you today?
2、特殊疑问词+谓语动词(组合)+主语+其他?例如:What is your name, please?
3、特殊疑问词+助动词+实义动词+其他?例如:What has been offered to the poor homeless children for the coming winter?
4、特殊疑问词+谓语动词(组合)+其他?例如:What must be finished first before we go to picnic two days later?