I have good reason to be suspicious.
我的懷疑有充分理由。
There is no reason to disbelieve him.
沒理由不相信他。
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.
這是她打電話的真實(shí)原因。
He said no but he didn't give a reason.
他說不行，但沒有說明原因。
There seems no reason to doubt her story.
似乎沒有理由懷疑她所說的話。