1.It will be months before we get the results.我们要等很长时间才能得到结果。

　　2.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。

　　3.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。

　　4.I didn't have time to change clothes before the party.我没时间在聚会前更换衣服。