题目内容：

Before,in front of,ahead of 三者的区别 ★★★♂光尘^_~心境

优质解答

in front of :在...前面 (相对静止的概念)before :在...前面 (+词、句子、一般和时间相连)ahead of :在...前面 (+时间、位置)(动态的行为)
He arrived before six o'clock.
He goes ahead of me.