Before是表示过去,应用于过去完成时态。
例句：
He paused before answering.
他在回答前停了下来。
Hopefully, well arrive before dark.
我们有望在天黑前到达。
It was many years before the full story was made public.
许多年之后，事情的.全貌才公之于众。
We will study the report carefully before making a decision.
我们将认真研究这份报告，然后再作决定。
I'd like a second opinion before I make a decision.
我在作决定之前，想听听别人的意见。
温馨提示：
