Why is it "son gun" and not "son gunu"?
"son" is an adjective and therefore does not form noun compounds. :)
And just to cover my bases (if you are thinking about this), only specific direct objects take the accusative case. Subjects and independent words never will.
why it is not "dün"? why it is "son gün" ?
I thought it meant "the end of the day" would it be "günün sonu"?