Hello...
Sometimes I find in grammar books that "ago" can only be used in past tense, not in past perfect tense.
Thus, "He did it 5 years ago" is correct and "He had done it 5 years ago" is wrong.
But, occasionally, I find the cases where "ago" is used with past perfect tense.
Below is one example:
https://www.google.co.kr/search?q=%22+if+they+had+ +years+ago+%22&num=20&newwindow=1&source=lnms&sa=X&ved=0ahUKEwiujbOPo6TeAhUJfLwKHTtyAP4Q_AUICSgA&biw=1920&bih=938&dpr=1
I guess that "ago" can be used in past perfect tense and that only the time point starts from now, not from a point in the past. Thus, "He had done it 5 years ago" is correct, 5 years starting from now.
Some advice would be greatly appreciated.
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This is pructus.
I didn't know I was not logged in.
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I hope this thread will be erased.