Which is right...?
1- He asked me who the best player in the team was.
2- He asked me who was the best player in the team.
3- He asked what the matter was.
4- He asked what was the matter.
5- He asked whose book was it.
6- He asked whose book was it.
It is known that the general rule in indirect question is the inversion of verb and subject, but I noticed the above sentences are all acceptable in some grammar books, would you please add more explanation about this subject. Thanks in advance.