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句型 They lived on the earth tens of millions of years ago, long before humans came into being... 千百万年前它们(恐龙)就在地球上生活，比人类的出现要早得多…… long before 早在……之前很久 before可做连词，，，。long before 。“不久以后”，相当于 soon after/shortly after, 既可以指将来，也可以指过去，所以与过去时或将来时连用，在句中做状语，不可以引导从句。 (2)long ago (现在的)很久以前。 (3)“It will be long before＋从句(一般现在时)”与 “It was long before＋从句(一般过去时)”的意思是“过很久才……”，强调经过的时间长。 (4)“It will not be long before＋从句(一般现在时)”与“It was not long before＋从句(一般过去时)”，意思是“没过很久就……”，强调经过的时间短。 注意：以上短语、句型中的 long均可以改用普通的时间名词或短语，表达不同的时间长度。 ①Long before, there was a big museum here. 很久以前，这里有一座大博物馆。 ②I had heard of him long before I came here. 早在我来这儿很久以前我就听说过他的情况。 ③Before long he went to Canada to go on with his further education.不久以后他就去加拿大继续深造了。 | 
