1.He need not have done it.
他本不需要做这件事。
2.Yet they need not have done.
然而他们没有必要这样做。
3.You need not have done it.
你本来不必做此事。
4.I quitted smokinglast month, but I need not have done so.上个月我把烟戒了，但我本不需要这样做的
5.If you have done your best, you need not feel bad about your failure.即使你一已经努力过，你对于失败便不必懊悔。
6.I do not think I really need (should) have done a break.我想我真的需要（应该）做了了断。
望采纳~
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