Three years后面系动词用单数还是复数?

Three years后面系动词用单数还是复数? three and three-sevenths后面的系动词是单数还是复数 three years has/have passed选哪个?语法书上写：年份看做整体用单数动词可有人说复数 No teacher and student后面谓语动词用单数还复数?No teacher and student后面谓语动词用单数还复数？ three years is a long time 句子对吗?three years 做主语动词使用单数还是复数 When and where to build the factory 后面谓语动词用单数还When and where to build the factory 后面谓语动词用单数还是复数? No teachers and no students 后面谓语动词用单数还复数? No teachers and no students 后面谓语动词用单数还复数?理由呢? Three years has past.为什么“three years”可以看做单数? Lily with her parents has been in the Greener China since three years ago.为什么谓语动词要用单数呢?^^^^谢谢 关于英语 单复数的两个问题 急three fifths of the population 后面的be动词形式是用 is 还是are?three fifths of the people 后面的be动词用复数还是单数? 一个小小的SAT语法问题.25years 后面的谓语动词应该是单数还是复数? 不可数名词后面谓语动词用单数还是复数? News后面动词用第三人称单数形式么?谢过. every后面的谓语动词用单数还是复数 we each后面动词用原型还是单数? many a boy 后面谓语动词用单数还是复数 plenty of 后面谓语动词用单数还是复数?