是用student‘s还是students’ writer a report about___vacation

是用student‘s还是students’ writer a report about___vacation every student 是单数还是负数?each student呢书上说Each student will have their own online teacher.为什么这里student不加s,又说their呢? no student作主语谓语用单数还是复数?注意是no student而不是students. 是you are a student还是you are student? student 交换生用英语说是exchange student还是exchanged student? he is a good student 表语是a student还是 student We are all student We all are student请问是We are all student 还是 We all are student each student是用is 还是用are 是a还是an university student? every student是单数还是复数 student 是开音节还是闭音节? most student 的 student 要加 s 什么时候用students'而不是student's carries the student’s 是The student's reading room还是the students' reading room阿? None of us是单数还是复数None of us_______(are/is) bad student(s). exchange student 前用a还是an?