Your guess is as good as mine. 我跟你一樣拿不準(zhǔn).
I've nothing to say about the decition. 我對(duì)這個(gè)決議沒(méi)什么可說(shuō)的.
I really don't know what to say. 我確實(shí)沒(méi)什么主見(jiàn).
I counld't say,I'm afraid. 恐怕我說(shuō)不上來(lái).
It makes no odds to me. 我無(wú)所謂.