I'm not sure about that.我想不大可行吧。
I wouldn't say that.我不贊成。
I 'm not sure that the case.我不確定是否是那樣。
Why not?為什么不?
It may not be that simple.問(wèn)題可能沒(méi)那么簡(jiǎn)單。
I don't often use them.我很少使用。
I Wouldn't really know.我不知道。
I 'm not really sure.我不大不確定。
I wouldn't know anything about that.我不知道。
There is nothing wrong with that.那個(gè)沒(méi)有什么不好。