The video teaches that 'ago' is used to measure time backward from the present moment and always pairs with the simple past tense (e.g., 'I saw him 2 days ago'), while 'before' refers to any time earlier than a specific point and can be used with past perfect tense to establish sequence (e.g., 'I had seen him before').
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earlier time or an earlier events.
I saw him 2 days from now backwards. 2 days from now, I saw him 2 days ago.
I had seen him earlier. I had seen him before.
She left a week from now backwards.
A week ago. She left a week ago.
I had visited this place earlier. I had visited this place before.
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