If you had warned me ahead of time, I wouldn't have done that.
如果你预先警告我，我就不会那样做了。
The train has left five minutes ahead of time.
火车提前5分钟离站了。
The projected housing development will go ahead next year.
计划中的住宅建设将于明年动工。
You are young and your whole life lies ahead of you.
你年纪轻，今后的日子还长着呢。
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