"I had known her before"
"as I said before"
"he called me the day before but your call had come even earlier"
"her parents had died four years earlier"
"I mentioned that problem earlier"
at or in the front;
"I see the lights of a town ahead"
"the road ahead is foggy"
"staring straight ahead"
"we couldn't see over the heads of the people in front"
"with the cross of Jesus marching on before"
before的用法和樣例：
例句
用作前綴 (pref.)
B comes before C in the alphabet. B在字母表裡排在C之前。
He made a statement before the House of Commons. 他在下議院當眾發表了一個聲明。
He always put the interests of others before his own. 他總把他人的利益放在第一位。
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