为什么是thirty years ago 而不是thirty years before?

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/15 16:22:15

efore要加在thirty years 前面吧,before是介词,ago是副词
介词后面要加名词,所以thirty years 要加在before后面
一下是谷歌金山词霸的解释：
ago ,before 这两个词都可表示“在若干时间以前”,但用法不同,初学者容易搞错.
ago,应注意两点：(1)用于一般过去时,(2)它所指的时间是从现在算起
before,也应注意两点：(1)它用于过去完成时,(2)它所指的时间不是从现在算起,而是从过去某一时刻算起,有时可以与previously换用

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