this is 与these are 的区别,该怎样讲解 this is 与these are

题目

this is 与these are 的区别,该怎样讲解 this is 与these are

答案

区别是this is 后面只能跟单数,如an appe ,a book
而there are后面必须跟复数,如 two books,three apples,many apples