陕西城际铁路集团好吗:They told me that he had left 2 hours before

来源：百度文库编辑：杭州交通信息网时间：2024/05/01 01:38:50

能否用ago？ago和befor好像都是在……以前。可否 2 hours ago.？

麻烦大家在不忙时候解答。

不可以，给你简单解释一下两者的区别。

*ago 指以现在为起点，往前（以前）推：
2 hours ago 两小时以前（从现在开始算）

*before从过去某一时间点为起点，往前（以前）推：
They told me that he had left 2 hours before ：他们离开是在告诉我时（过去）以前两小时。（从They told me 开始算）

所以，ago通常用在过去式（现在的过去），before通常用在过去完成式（过去的过去）。

这样解释，楼主能明白么

ago用于一般过去式
before用于现在完成时

记住就行.
实在要弄清区别的话，就去在字典里看看这两个词的有关例句，形成语感就行。

ago是以现在为参照时间说的。

before是以过去某时为参照时间说的。
这句话用的本来就是过去时，以那个时间为参照，过去的过去就是用before啦！

用hours ago.

学习一下

They told me that he had left 2 hours before 5 He told me that he had no choice but ____ (stay) at home. They told me the ()story 转换句子 The fact that he told me the story made me even more startled (用It was the more开头） When they told me.....求找歌名及歌唱者! He told me his story and his sister He must be the man you told me about, ________? This (convince) me that he is honest he told us that he ran the fastest of the all the boys in his class Henry told joy and his classmates that he had a better one