I want to know what is the matter with you?这个句子中,what 做主语 ,那

what做主语,同时也是连接词。因为what做主语,本来特殊疑问句就是陈述语序,所以不用改变什么。
where做状语,同时也是连接词。因为where不做主语,所以原来疑问句用疑问语序,变成宾语从句时要变成陈述语序。
类似的句子有what is wrong with you?what made you sad?who loves you?what is the matter with you?what happened?what is up?who did it?what troubled you?这些句子都是what who做主语,虽然是特殊疑问句,确实陈述语序。变成宾语从句时,语序不发生变化。