I don't know what is the matter with him这里为什么不用陈述句句式

I don't know what is the matter with him这里为什么不用陈述句句式
I don't know what is the matter with him这里为什么不用陈述句句式

I don't know what is the matter with him这里为什么不用陈述句句式
what is the matter,what is wrong,what happen等句子,既是疑问语序又是陈述语序
祝楼主更上一层楼