You need not feel obliged to contribute.

你不必认为你非得捐款。

《柯林斯英汉双解大词典》

Previous applicants for the post need not reapply.

申请过这个职位的人不需重新申请。

《牛津词典》

From the day you arrive at my house, you need not spend a single penny.

从你到我家的那一天起，你就分文不需花了。

《柯林斯英汉双解大词典》

"My brother need not be idealized or enlarged in death beyond what he was in life;

VOA: special.2009.08.29

The Roman poet philosopher Juvenal said men need not so much be informed as reminded.

罗马哲学家尤维纳利斯说过,人们更需要记住，而不是被通知。

麻省理工公开课 - 固态化学导论课程节选

Or "you need to do something" or "you need not to do something".

或者“你应该做某事”或“你不应该做某事”。

I'm sure 课堂 - SpeakingMax英语口语达人

Biological interventions need not be draconian, and it's never too early to stop the rot.

CNN: Opinion: Unlocking crime using biological keys

This means that affected taxpayers will need not contact the IRS to get this relief.

FORBES: IRS Announces Tax Relief For Oklahoma Tornado Victims

For incumbents this ought to be reason for paranoia, but it need not spell doom.

ECONOMIST: Stand by for a spot of creative destruction