Every plant,animal,and human being needs water to stay alive.为何need要加s

Every plant,animal,and human being needs water to stay alive.为何need要加s
Every plant,animal,and human being needs water to stay alive.为何need要加s

Every plant,animal,and human being needs water to stay alive.为何need要加s
因为句首的every-每一个,强调的是每个生物体,再者这里的and应理解为“以及”

因为every是每个的意思，后面跟的名词也都是单数。

强调每一个，你可以用中文理解一下，每一个当然是单数了