need not的用法和樣例：
例句
- You need not have bought extra oil for this short trip.
在這麼短的旅程中，你實在沒有必要多買油。 - It was fine that day, so I need not have brought an umbrella with me.
那天天氣很好，我原本不必帶傘的(但卻帶了)。 - Even if he said so, you need not believe him.
即使他這麼說，你大可不必相信他。 - You need not have got up so early.
你不必起得那麼早。
