the doctor needs operate on him 还是needs to operate?

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the doctor needs operate on him 还是needs to operate?
the doctor needs operate on him 还是needs to operate?

the doctor needs operate on him 还是needs to operate?
都可以的~意思一样的~只不过need的词性不同
前者是实义动词:need to do sth
后者是情态动词:need do sth

都可以。need do sth need是情态动词。后接动词原形
need to do sth need是 实义动词 ,后接不定式

the doctor needs to operate on him