before long; long before辨识
before long相当于soon, a little later,意为\"不久或不久以后\",常与将来时、过去时态连用,在句中作状语。如:
The book will be published before long. 那本书不久将要出版。
Before long he came to Canada to go on with his education. 不久以后他去了加拿大继续深造。
long before相当于long, long ago意为\"很久;很久以前\",常用于过去时或过去完成时。如:
Long before, there is a big museum here. 很久以前,这里有一座大博物馆。
I had heard of him long before I came here. 我来这儿很久以前就听说过他的情况
long before:之前很久
before long:固定词组:不久
第一个是“很久以前”的意思,第二个是“不久前”的意思。