B5U4
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。
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