一个英语语法问题.为什么need和contain后面要加S?而有些不用呢?
Evryperson(needs)waterandadietofhealthyfoods.Thesefoodsshould(contain)somefat,somefibre,alittlesaltandsoon.
It(contains)alotoffruitandgreenvegetable.
People(need)energytolive.
大家请注意最后一句:Peopleneedenergytolive.这里People是复数但是为什么need后面却不加S?