你妈妈是干是什么的?What's your mother? What does your mother do? What 's your mother's job?这三个句子都可以,what's your mother do?是错误的,因为what's等于what is ,is是be动词,be动词后不能跟动词原do. what's he look like?同理 look也是动词原形,不能与be一起用,要借用助动词does所以what does he look like?是正确的。或者说:What is he like? like是介词“像”,可以与is一起用。 be like 意思是像 look like “看起来像”追问