There must be something wrong with the watch,()?

反义疑问句
There be句型
There be 句型中,反义疑问部分必须为be 动词 + there There are some apples in the basket, aren't there? There isn't any milk left, is there?
must
.当陈述部分有情态动词must,问句有4种情况： （1）mustn't表示“禁止,不可,必须”时,附加问句通常要用must. You mustn't stop your car here,must you? 你不能把车停在这地方,知道吗? （2）must表示“有必要”时,附加问句通常要用needn't. They must finish the work today,needn't they? 他们今天要完成这项工作,是吗? （3）当must用来表示对现在的情况进行推测时,问句通常要根据must后面的动词采用相应的形式. He must be good at English,isn't he? 他英语一定学得很好,是吗?