needn't和don't need的区别和用法?
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回答如下:
needn't (不必,不需要)中的need是情态动词,情态动词后跟动词原形; don't need中的need(需要)是行为动词,后跟名词、不定式或名词+不定式。另外,情态动词need 和行为动词need的否定和疑问形式也不一样,情态动词need只用于疑问句和否定句,而行为动词need则可用于肯定句、否定句和疑问句。例如:
We need an office.
He needs us to help him.
They need to leave here.
Do you need to stay here?
We don't need to stay here.
Need you have a rest ?
We needn't stay here.
needn't (不必,不需要)中的need是情态动词,情态动词后跟动词原形; don't need中的need(需要)是行为动词,后跟名词、不定式或名词+不定式。另外,情态动词need 和行为动词need的否定和疑问形式也不一样,情态动词need只用于疑问句和否定句,而行为动词need则可用于肯定句、否定句和疑问句。例如:
We need an office.
He needs us to help him.
They need to leave here.
Do you need to stay here?
We don't need to stay here.
Need you have a rest ?
We needn't stay here.
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needn't是情态动词的否定式,don't need是动词的否定式
need既可用作情态动词,也可用作实义动词。当need作情态动词时,意思是“必要,必须”,主要用于否定句(needn't)和疑问句,第三人称单数不加s,过去式不加ed;
当need作实义动词时,意思是“需要,想要”,可用于肯定句,否定句(don't need)和疑问句中,第三人称单数要加s,过去时要加ed,其后接的不定式要加to。
例:I want to go to the dentist,but you needn't go with me.
我要去看牙科医生,但你不必跟我一起去。(need作情态动词)
例:I don't need to buy a new pair of shoes.
我不需要买一双新鞋子。(need作实义动词)
need既可用作情态动词,也可用作实义动词。当need作情态动词时,意思是“必要,必须”,主要用于否定句(needn't)和疑问句,第三人称单数不加s,过去式不加ed;
当need作实义动词时,意思是“需要,想要”,可用于肯定句,否定句(don't need)和疑问句中,第三人称单数要加s,过去时要加ed,其后接的不定式要加to。
例:I want to go to the dentist,but you needn't go with me.
我要去看牙科医生,但你不必跟我一起去。(need作情态动词)
例:I don't need to buy a new pair of shoes.
我不需要买一双新鞋子。(need作实义动词)
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