还有点疑问是,I don't know what's the matter with you?这句话为什么不是

what's the matter with you在句中是作宾语的,按理说宾语从句要还原成陈述句语气,就是I don't know what the matter with you is,但是我们老师说这是一个特例,这一句可以不用还原,至于还有没有其他类似的就不知道了.