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Since (adverb)
From a specified time in the past.
“I met him last year, but haven’t seen him since.”
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Since (preposition)
From: referring to a period of time ending in the present and defining it by the point in time at which it started, or the period in which its starting point occurred.
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Since (preposition)
Continuously during that period of time.
“I have known her since last year.”
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Ago (adjective)
Gone; gone by; gone away; passed; passed away.
“in days ago/in days agone”
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Ago (adjective)
Nearly gone; dead 19th century]]
“Woe the day- she is agone!”
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Ago (adverb)
before
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