一般说来反问句都是以动词或是助动词否定结构.比方 don't,can't,isn't 开头,在追问原因的时候就把 why,w-h-y,why 放在句子的最前头,比方对话里的 Why don't you watch it with me?就是一个例子.反问句有几种用途,比方可以用来提出建议,对话里的 Why don't we go out to lunch today?意思就等于 Let's go out to lunch today!也就是 "我们今天出去吃中饭吧!"