long before
很早以前
before long
adv.
不久以后
before long(=soon)與long before的區(qū)別：before long“不久”、“很快”,用于各種時態(tài).例：We'll meet again before long.long before是“很久以前”,單獨使用,一般用在過去完成時的句子里.例：They said they had seen the film long before.同時,long before后可以接從句.I had seen the film long before you saw it.