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1、long before有两个用法：(1)单独使用，表示比过去某时早得多的时间.老早，早就。如：She had left long before.她老早就离开了。That had happened long before.那事老早就发生了。注：long ago 表示“很久以前”，指的是从现在算 起的很久以前，通常与一般过去时连用：I met him long ago.我很久以前就认识他了。,(2)后接名词或句子，在的很久以前，在还没有的很久以前。如：She had left long before his return he returned.在他回来的很久以前她就走了。He had worke
2、d in the factory long before he got married.在他还没有结婚的很久以前他就在这家工厂工作 注：此时的主句谓语通常用过去完成时，但主句谓语也可用一般过去时(因为 before 已体现了动作的先后关系)。如：This happened long before you were born.这事在你还没出生以前很久就发生了。It is was,will be long before在前需要很久。It was long before he came back.过了好久他才回来。It wont be long before we see each other.不久
3、我们又会见面的。,(3)用于 It is long before.，其字面意思是“在之前需要很久时间”，具体意思视语境而定。如：It was long before he came back.过了好久他才回来。It wont be long before we see each other.不久我们又会见面的。比较以下同义句：Before long he went to Paris.不久他就去了巴黎。It wasnt long before he went to Paris.不久他就去了巴黎。,一、before long的用法 before long 意为“不久”、“很快”(soon)，可用于
4、将来或过去时态。如：I hope to see you again before long.我希望不久能再见到你。Before long he came to a small village.不久他来到了一个小村庄.Ill be back before long.不久我就回来。Before long he got married.不久他就结婚了。,before long 与long before记忆诀窍和用法介绍记忆诀窍:long 在前很久前long在后不久后 long before单独使用，一般用在过去完成时的句自里。它后面可以跟从句构成句型：It be.before.before 前一般是
5、long,not long 等词。值得注意的是：主句中的时态只能是一般过去时或一般将来时。before long 很快、不久，可以用于各种时态。before long.不久 very soon I hope to see you before long.我盼望不久就能见到你。long before 很久以前 a long time earlier Weve seen that film long before.我们早已看过那部电影了。Mark learned to read long before he started school.马克上学之前很早就学会了看书。,long before 很久
6、以前 before long不久以后 long before是很久以前的意思 before long 是不久之后的意思 你可以这样记 long在前 很久以前,long在后 不久之后.你不如试着这样记忆：before long意为“不久，很快”（其中before是介词，long是名词），常在句中作状语，多与动词的过去时或将来时连用。例如：The work will be finished before long.工作不久就会完成。Before long he had to move on again.不久，他被迫再次迁移。,long before意为“很久以前”（其中long是副词。long b
7、efore单独使用时，before是介词；long before后接从句时，before是连词。这个词组常与过去时或过去完成时连用，跟从句时也可用在一般现在时的句子中。例如：She said that she had heard of it long before.她说她早就听说过此事。It will be long before he arrives.还要等很久他才能到达。,It was not long before he was born that his mother died.这句话是一句强调句，它本身实际上已经不属于“It was not long.before”的结构。注意这里是it+动词be+that的结构，是强调句形式。强调句有一个特点：去掉it was 以及后面的that之后句子的意思没有变化。因此这句话可以改为：Not long before he was born his mother died.It was not long before he realized the fact这句话可以分开来理解：It was not long表示时间并不长；before是指在之前；he realized the fact他知道真相。全句话的意思也比较简单：他刚刚知道真相。,
