reason的用法与搭配：可作名词，含义为“原因”、“解释”、“正当理由”、“思考力”、“理性”，固定搭配为reason to do sth；可作动词，含义为“推理”、“思考”、“理解”，固定搭配为reason sth out/reason with sb。
reason作为名词时基本含义及用法介绍
当reason作为名词时，意为原因;理由;解释;正当理由;道理;情理;思考力;理解力;理性。
例句：I'd like to know the reason why you're so late.
我想知道你为什么迟到那么长时间。
For reasons of security the door is always kept locked.
为了保证安全，门总是锁着的。
They have reason to believe that he is lying.
他们有理由认为他是在撒谎。
Only human beings are capable of reason.
只有人类才有理性思考的能力。
I can't get her to listen to reason .
我没法跟她讲道理。
There is a reason for every important thing that happens...
每件重要事情的发生都有原因。
They had reason to believe there could be trouble...
他们有理由相信可能会遇到麻烦。
当reason作为动词时基本含义及用法介绍
当reason作为动词时，意为推理;推论;推断;思考;理解。
例句：She reasoned that she must have left her bag on the train.
她断定准是把包落在火车上了。
I reasoned that changing my diet would lower my cholesterol level...
我推断改变自己的饮食可以降低我的胆固醇水平。
Is group identification an adequate basis for political reasoning?
群体认同是否为政治理解的充份基础？
His brain had already lost the ability to reason.
他的头脑已经丧失了思考的能力。
They reasoned, correctly, that she was away for the weekend.
他们的推断没错，她出去度周末了。