need 后接 动词什么形式

当need为情态动词时,后直接加动词原形
陈述句式:主语+need+v/原形
eg: I need water the flowers.
否定形式:主语+needn't+v/原形
eg: I needn't water the flowers.
一般疑问句:Need+主语+v/原形
eg: Need you water the flowers?
当need为实义动词时,后接动词不定式或动名词形式或名词
need to do
陈述句式:主语+need/needs/needed+to+v/原形
eg:I need to water the flowers.
否定形式:主语+do/does/did+not+need+to+v/原形
eg:I don't need to water the flowers.
一般疑问句:Do/Does/Did+主语+need+to+v/原形
eg:Do you need to water the flowers?
need+doing 此用法含有被动语义
陈述句式:主语+need+doing
eg: The flowers need watering.
否定形式:主语+do/does/did+not+need+doing
eg:The flowers don't need watering.
一般疑问句:Do/Does/Did+主语+doing
eg: Do the flowers need watering?
need+n
陈述句式:主语+need+n
eg: I need flowers.
否定形式:主语+do/does/did+not+need+n
eg:I don't need flowers.
一般疑问句:Do/Does/Did+主语+need+n
eg:Do you need flowers?

need大致有三中用法
1.need to do sth.(此时need是普通的不及物动词)
2.need do sth.(此时need是情态动词,故后面跟动词原形)
3.need sth/doing(此时need是普通的及物动词,故后面跟名词或动名词

need doing sth.

动词不定式