There are three common configurations of content interrogatives: in the first one, the question sign occurs in its basic (i.e. in-situ) position, namely, if it questions the subject, the subject position, if it questions the object, the object position etc.
who trash throw
‘Who threw the trash?’
ix2 what buy
‘What did you buy?’
ix2 yesterday why work come^not
‘Why didn’t you come to work yesterday?’
In the second configuration, a question sign occurs twice in the question (doubling): with one copy in the basic position and one copy in the question-final position, see [Syntax – 1.2.3.7].
In the third one, the question sign occurs in the sentence-final position.
now do what
‘What will be done now?’
(Dikyuva et al. 2015: 274)
surgery poss1 sign who
‘Who will sign my surgery (papers) now?’
(Dikyuva et al. 2015: 277)
A less common configuration is where a question sign occurs question-initially.
when ix2 go
‘When are you going to go?’
(Makaroğlu, 2012: 85)