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1.after“…时间后”结构：after+时间段，常用于一般过去时，和1相同。

They went to Beijing after five days. The dog died after a week。

2.(after也可加句子， 但主句不一定用一般过去时：I’ll send you an e-mail after I get home。

Return it to me after you finish it. 见2.)

3.ago“…时间前”结构：时间段+ago, 用于一般过去时。

The Greens moved to Shanghai four weeks ago. I saw it ten minutes ago。

4.(若有since+时间段+ago，常用现在完成时：Mr. Li has worked here since 5 years ago。)

5.before 单独放在句尾，常用现在完成时：“以前”

I have been to London before. He has seen the film before。

(若是时间段+before,常用过去完成时，“…前”： I had seen the film two weeks before. We had found out the answer to the problem an hour before。)