~ 과거에 했던 일에 대해 말하려면
a year before, I went to... ❌
a year ago, I went to... 👍
one hour before, I had to... ❌
one hour ago, I had to... 👍
six months before, I came back from... ❌
six months ago, I came back from... 👍
~ before의 한 가지 중요한 사용할 경우는 perfect aspect으로 된 절에서 더 먼 과거에 했던 일에 대해 말하려고 하는 경우입니다
one year ago I went to America, and one year before that I had gone to Korea.
I had just gotten home an hour before, when I accidently fell asleep.
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