英语 宾语从句中为何不用ago而是 before例 he told me that he had seen his father two days ago or before

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英语 宾语从句中为何不用ago而是 before
例 he told me that he had seen his father two days ago or before

你可以说2 days ago,也可以说before 2 days,但在完成时中常只单独用BEFORE,例子:I HAVE MET HER BOFORE.

before是介词,动词介词才可以加宾语呀
ago是副词,副词后不可以家宾语呀

就是不用的吧,
个人觉得语法这个东西,有什么太过深究也没意思啦``记住就好啦