In the past,we also issue letters before students' final year began to let them know what they needed to take in the fin
问题描述：
In the past,we also issue letters before students' final year began to let them know what they needed to take in the final year to be OK,but we don't do that anymore.
这句话里面的issue 怎么不是过去式啊?began 是把前面的整句话当成是主语么?可以分析下这句话语法么?
答
in the past,是状语 we是主语 also issue是谓语 貌似前面省略了 should letters是宾语 before students' final year began 是时间状语从句 修饰 issueto let them know是目的状语从句 修饰issuewhat they needed to ...began为什么不能用begin呢？began不能用begin因为 主语 是 students' final year这是 指以前的情况 你的 意思是前面 为什么 可以用issue我认为是省略了 should 而 before 从句 是 时间状语从句 这里 时态只能用 一般过去时 与主将从现 的道理一样 。也就是 主句用过去将来时 时间状语从句 用一般过去时