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Time expressions place an action in time. "Ago" follows a period of time and pairs with the past simple; "since" marks a starting point and "for" a duration, both often with the present perfect.
I have lived here for 2018.
I have lived here since 2018. — Use "since" with a starting point, not "for."
I moved here since two years.
I moved here two years ago. — Use "ago" with the past simple and a time period.
for
ago