firstly, how would i say 'according to him'? could i say 'oca' like bence (i guess not), or could i say 'ona göre', using the '-a göre' suffix?

and also, how can i say 'without him'? is it osiz? because im sure i have never seen this!

thanks so much if anyone can help

according to him= ona göre
without him= onsuz

thanks very much