How do you say :

I wonder?

Really Im am unsure of this but these are my attempts at "I wonder.."

niyetti tutuyorum
niyetti ediyorum
dusunuyorum
merak ediyorum
merak oluyorum

 If it is like I worry or want to know about something:

merak ediyorum

If it is like I am just thinking about:

düþünüyorum

I think you can use ´acaba´ at the end of a sentence.

eg  ´What time is it ,I wonder?

 Saat kaç,acaba?

 you can start to sentence with "acaba" like "i wonder."