before long（不久以后）常用于一般将来时。如；We'll meet again before long.附录：before long(=soon)与long before（很早以前）的区别：before long（不久以后）常用于一般将来时。We will see the film before long.我们不久就能看到那部电影了。 long before是“很久以前”，单独使用，一般用在过去完成时的句子里。例：They said they had seen the film long before.同时，long before后可以接从句。I had seen the film long before you saw it.
