I grant that your explanation is reasonable.（英译中)

The reason why we have to grow trees is that they can supply fresh air for us.（英译中)

What was the real reason for your absence？（英译中)

We have reason to believe that he was murdered.（英译中)

I have the right to ask for an explanation.（英译中)

May I borrow your pen？（英译中)

Your life is your own affair.（英译中)