need not have

例句：

1. 1. I should not have taken the risk.
   我本不应该冒这个险。
2. 2. She needed not to apologize for her mistake.
   她本不需要为她的失误道歉。
3. 3. You don't need to worry about it;it's all in your head.
   你本不必为此担心，这都是你的想象。