each students是三单吗?each of them

each students是三单吗?each of them each of them ,each students,each student 后分别如何接is,are either of them 和 each of them each of them 和each of these的区别? each of them 与we could each的区别 each of them has they each have 为什么? each of the students has 和 the studets each have each student ? ((have) each of the students ? (have)] studen each of them算单数还是复数 Each of them are还是is clever. Each one of them 等于 一个词语 Each of the students there___an Engish book.