There was a time when I hated to go to school 句中为什么用a 而不用the

题目

There was a time when I hated to go to school 句中为什么用a 而不用the
是不是There be 后面跟的名词的前面不能用THE特指呢

答案

a time 表一段时间,the time表特定时间
there's a time是固定搭配