中科新闻网僵尸世界大战2视频:"need"后加“do"还是"to do"?
来源：百度文库 编辑：中科新闻网 时间：2024/04/30 01:59:58
need的用法
1.当「名词」用(可数名词)
ex: There is no need for anxiety.【不必焦虑.】
ex: My needs are few. 【我的需要很少.】
2.当「一般动词」用
(1).人 + need + to + 原V(人必须做to + 原V之事)【need to = have to】
ex: He needs to study hard. = He has to study hard.
(2).物 + need + V-ing(物必须被V)【含有被动意思】
ex: The car needs washing.
3.当「助动词」用(同can,主词为第三人称单数时,亦不需加s,且只用於否定句及疑问句中)
(1).Do you need to … = Need you …
(2).We don't need to …. = We needn't ….
(3).He doesn't need to …, does he = He needn't …, need he
ex: Do you need to get up so early = Need you get up so early
ex: They don't need to send the letter after all. = They needn't send the letter after all.
当need为情态动词时,加do.
其他加to do
need+doing表示被动含义
These flowers need watering.
这些花需要浇水.
两者都可
加do的need是情态动词
加to do的是一般动词
do
need是情态动词，情态动词后跟原形，所以是do.
need to do something.