特殊疑问句改间接引语用陈述语序

特殊疑问句改间接引语用陈述语序
特殊疑问句改成陈述句（间接引语）
Whose is this apple?
Whose apple is this?
Which is the way to the museum?
What is his name?
What's the matter?
分别改为用He asks ...间接引语
直接引语变间接引语,要注意人称、时态和句式的变化.
要注意主句的时态；从句要用陈述语序.
He asks whose this apple is.
He asks whose apple this is.
He asks which is the way to the museum.
He asks what his name is.
He asks what is the matter.
为什么答案中的IS的位置不同?不是要陈述语序吗?就像最后那句,He asks what the matter is,这样不行吗?