twoyearsbefore\ago,beforetwoyears区别?

Question

two years before\ago ,before two years 区别?

Answer 1

two years before 和two years ago 都表示“两年以前”,但是时态不同.
two years before 用于完成时
two years ago 用于过去时
例如：
He went to Beijing two years ago. 他两年以前去北京的.
He told me that he had been to Beijing two years before.他告诉我他两年以前去过北京.

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