答案是：“Are the Smiths eating supper at home?” 当把陈述句变为一般疑问句时,把be动词提前,本句就是这样的.
没有be动词的,用助动词代替动词提前,下面举一个助动词的例子：
she go to school everyday .
改为一般疑问句：“does she go to school everyday "
有问题欢迎再咨询,