2 days ago I went to see him,but his neighbour said that he had left four days before,
before 与ago 的区别
人气：397 ℃ 时间：2019-10-14 05:44:55
解答
很简单
ago 用于过去时
before 用于完成时.
ago意思是之前,是一个准确的时间.3days ago,三天之前的那一天.
before不是一个准确的时间.before May,五月之前的那段时间,哪一天不确定.
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