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- 你不应该让士兵们冒不必要的危险。
You shouldn't expose the soldiers to unnecessary risks.
- 你不必起得那么早。
You need not have got up so early.
- 当时他不必来。（但却来了）
He need not have come. (But he came.)
- 即使他这么说，你大可不必相信他。
Even if he said so, you need not believe him.
- 那天天气很好，我原本不必带伞的（但却带了）。
It was fine that day, so I need not have brought an umbrella with me.
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