1
need not + bare infinitive
You need not worry.
你不必担心。
不必; 无须; 毋庸; 无庸
先理解核心含义，再看它在真实句子里的用法。
不必; 无须; 毋庸; 无庸
You need not worry.
你不必担心。
need
Base
原形
needs
3rd person
第三人称单数
needing
-ing
现在分词
needed
Past
过去式
needed
Past participle
过去分词
You need not worry about the exam.
你不必为考试担心。
She need not apologize for the mistake.
她不必为那个错误道歉。
情态动词，意为“不必”，后接动词原形，无第三人称变化。
You need not worry about the test; it will be easy.
你不必担心考试；它会很容易。
We need not leave early because the train is at nine.
我们不必早走，因为火车九点才开。
She need not come to the meeting if she is too busy.
如果她太忙，她不必来开会。
You need not worry.
你不必担心。
表示过去做了某事，但实际没有必要。
You need not have called.
你本不必打电话的。
It need not be expensive.
它不必很贵。
Not this
You need not to go.
Use this
You need not go.
在'need not'之后，动词应使用不带to的不定式（原形），因为'need not'在此处是情态动词用法，类似于'must not'。错误地添加'to'是常见的语法错误。
Not this
He needs not go.
Use this
He need not go.
'need not'作为情态动词短语时，不受主语人称和数的影响，第三人称单数主语后仍用'need'原形，不加-s。这是与实义动词'need'的区别。
Choose the next layer that will help you use need not with more confidence.
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Use need not naturally, then get feedback on meaning, tone, grammar, and phrasing.
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用作情态动词，后接动词原形，表示‘不必’
Dictionary facts from ECDICT, WIKTIONARY.