hindsight：the ability to understand a situation only after it has happened 

例句：With hindsight, I should have double-checked the procedure and made sure all was going well.   

in hindsight 或 with hindsight，意思就是事后想来，......

仿写：With hindsight，I should follow my heart and insist my opinion all the time.

例句：With hindsight, I should have consulted a lawyer before making the final decision.   

仿写：With hindsight，I should have asked help from my professor before hand in my paper.

With hindsight, I should have done

翻译：With hindsight，I should have been more patient with him.

造句：With hindsight，I should have been more hard-working before Gaokao，the college entrance exam.