I don't think she [needs] to drink lots of water.为什么need后要加s

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Idon''tthinkshe[needs]todrinklotsofwater.为什么need后要加sIdon''tthinkshe[needs]todrinklotsofwater.为什么need后要

I don't think she [needs] to drink lots of water.为什么need后要加s
I don't think she [needs] to drink lots of water.为什么need后要加s

I don't think she [needs] to drink lots of water.为什么need后要加s
主语是单数第三人称 事态是一般现在时态谓语动词就得加 s

在宾语从句中need 用作实义动词,主语又是第三人称单数,所以加s

she needs
第三人称

think后面省略了一个that,think后面其实是一个that开头的从句,从句中的谓语动词要跟着从句中的主语进行变化,这句话不省略应该是:I don't think that she needs to drink lots of water.这里把 that省略了,其他不发生变化,所以need后应该加“s”。明白了吗?