英语中为什么“孩子们”The Children不用加S

英语中为什么“孩子们”The Children不用加S The children are going swim.为什么swim不用加ing? 为什么The children go to school.中go不加s. Are these the children's books? children's 前面为什么加定冠词the ? the children cooperated with their teachers 为什么teacher加s let's talk about the picture.中talk用不用加ing为什么 Let’s talk about the picture.中talk用不用加ing为什么? 为什么"the 20 dollar"的"dollar"后面不用加"s"? what time the film starts?为什么start不用加s. 英语分析结构Children are what the mothers are翻译及分析结构为什么mother加s,ch 为什么 favorite exercise中exercise不用加s 1,.为什么in class与in the classroom中,“in class”不用加the?2,it's