まさか
masaka!
No way! / Impossible!
まさか、嘘うそでしょう。
masaka, uso deshou.
Surely that's a lie.
まさか彼かれが犯人はんにん?
masaka kare ga hannin?
Could it be that he is the culprit?
まさか本当ほんとうだとは。
masaka hontou da to wa.
I can't believe it's true.