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?yàn)槟硞�(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)。