I have good reason to be suspicious.

　　我的懷疑有充分理由。

　　There is no reason to disbelieve him.

　　沒(méi)理由不相信他。

　　Are you angry with me for some reason?

　　你是因為某個(gè)原因生我的氣了嗎？

　　This was the real reason for her call.

　　這是她打電話(huà)的真實(shí)原因。

　　He said no but he didn't give a reason.

　　他說(shuō)不行，但沒(méi)有說(shuō)明原因。

　　There seems no reason to doubt her story.

　　似乎沒(méi)有理由懷疑她所說(shuō)的話(huà)。