long before?before long?英语问题

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long before?before long?英语问题
都什么意思?
详细点～～～

long before 是“很久以前”的意思.同long long ago.
单独使用,一般用在过去完成时的句子里.
She said she had seen the film long before.
她说她很久以前就看过这部电影.
before long 是“很快,不久以后”的意思,
可以用于各种时态.例如:I'll see the film before long 我不久就要看这部电影.

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