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时间表达把动作放置在时间中。"Ago" 跟在一段时间之后，与一般过去时搭配；"since" 标记起点，"for" 标记持续时间，两者通常都与现在完成时搭配使用。
I have lived here for 2018.
I have lived here since 2018. — 表示起点使用 "since"，而不是 "for"。
I moved here since two years.
I moved here two years ago. — 与一般过去时和时间段搭配使用 "ago"。
for
ago