I'm really sure not how they go together...
They've got this hip new preacher at church, I'm not sure I really like him.
Hmmm you know what on second thought I'm not sure I really want to go to the techno bar tonight.
I'm not sure what's going on here, but I don't object.
I think this is hot, I'm actually not sure.
Not sure we'll really want to get behind the music.