Ago always counts back from the present time. If we are counting back from a past time, use -> before .Examples: I met Steven in Germany 10 years ago. Talking to him I found out that I had been at university with his sister twenty years before. She met him in France in November 2008; he told her he had published a book five years before.
Ago : 현재 싯점에서 과거일 경우 사용
before : 과거 싯점에서 더 먼 과거일 경우 사용
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