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long before和before long区别：long before意为“在很久之前，很久以前”，用于过去完成时；before long 意为“不久之后”，用于一般将来时或一般过去时。
long before和before long区别
before long 和long before 是意思完全不相同的两个词组。before long是介词短语，意为“不久以后”、“不久”。如：I hope to see you before long。我希望不久能再见到你。long before：它单独使用时是副词短语，表示“很久以前”。如：I saw the film long before。我很久以前就看过这部电影。
long before造句
1、We have heard about this new type of machine long before.
关于这类新型机器，我们很久以前就听说过。
2、The reference book for teaching came out long before.
教学参考书很久以前就出版了。
3、The area was inhabited long before the dawn of recorded history.
早在有历史记载之前很久这个地区就有人居住了。
before long造句
1、Before long she had been called upon to undertake another journey.
不久以后，她将被号召做另一次旅行。
2、Before long you will notice the changes in your life, as that which you ask for manifests.
不久以后，你会注意到你生活中的变化，就像你请求所显现的那样。
3、We'll be home before long.
我们很快就要到家了。