Phrase
need not
/niːd nɔt/
verb
不必; 无须; 毋庸; 无庸
In use
You need not worry about the test; it will be easy.
We need not leave early because the train is at nine.
She need not come to the meeting if she is too busy.
need not + bare infinitive
You need not worry.
你不必担心。
need not have + past participle
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。
need not + be + complement
It need not be expensive.
它不必很贵。
Verb forms
base need · third person needs · -ing needing · past needed · past participle needed
情态动词，意为“不必”，后接动词原形，无第三人称变化。
Common mistakes
You need not to go.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。
He needs not go.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。
Connections
Learner notes
Grammar Note
用作情态动词，后接动词原形，表示‘不必’
Dictionary facts from ECDICT, WIKTIONARY.