efore可以作副词,也可以作连词.
第一句话中before是副词,意思是“以前”.它后面没有也不能引导时间状语从句.又如：
Who are you?I've never seen you before.你是谁?我以前从来没有见过你.
第二句话中的before是连词,引导时间状语从句.不能放在句末.又如：
I got up before the school bus arrived.在校车到来之前我就已经起床了.
he acted as if he had never lived in England before.
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