reason用法与搭配：可作为名词，含义为原因reason to do sth；可作动词，意思是推理reason sth out/reason with sb。
例句：I’d like to know the reason why you’re so late.
For reasons of security the door is always kept locked.
They have reason to believe that he is lying.
Only human beings are capable of reason.
I can’t get her to listen to reason .
There is a reason for every important thing that happens…
They had reason to believe there could be trouble…
例句：She reasoned that she must have left her bag on the train.
I reasoned that changing my diet would lower my cholesterol level…
Is group identification an adequate basis for political reasoning?
His brain had already lost the ability to reason.
They reasoned, correctly, that she was away for the weekend.