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?

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