before long与long before与long ago的区别 及其相关练习.doc

before long与long before与long ago的区别1.before long的意思是“不久，很快”。（用于一般将来时或一般过去时）Ill be backbefore long. 不久我就回来。（一般将来时）Before longhe got married. 不久他就结婚了。（一般过去时）2.long before有两个用法：(1)老早，早就(单独使用，表示比过去某时早得多的时间。用于过去完成时)She had leftlong before. 她老早就离开了。（过去完成时）That had happenedlong before. 那事老早就发生了。（过去完成时）【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 himlong ago. 我很久以前就认识他了。（一般过去时）not long ago 表示“不久前”，指的是从现在算起的不久前，与一般过去时连用：Not long agoa rare new species of bird-like dinosaur was discovered in Chaoyang County, Liaoning Province.不久前，在辽宁省的朝阳县新发现了一种罕见的、形状像鸟一样的恐龙。(2)在的很久以前，在还没有的很久以前。如：Shehad leftlong before his return he returned. （过去完成时）在他回来的很久以前她就走了。Hehad workedin the factory long before he got married. （过去完成时）在他还没有结婚的很久以前他就在这家工厂工作了。【注】：此时的主句谓语通常用过去完成时，但有时也可用一般过去时(因为 before 已体现了动作的先后关系)。如：Thishappenedlong before you were born. 这事在你还没出生以前很久就发生了。3.区别以下句型：(1)It is was, will be long before“在前需要很久”，“费时间才”。It was long before he came back. 过了好久他才回来。It was long before we knew what was wrong with our plan.费了很长时间我们才知道计划错在哪里。(2)It is / was not (wont be) long before“不久就”It wont be long before you get well.你不久就会康复的。（注意在before从句里用一般现在时代替将来时）It wont be long before we see each other.不久我们又会见面的。（注意在before从句里用一般现在时代替将来时）练习：1. They _ on the earth tens of thousands of years ago, _ humans came into being and their future seemed secure at that time.A. had lived; long beforeB. had lived; long agoC. lived; long beforeD. lived; before long2. _he will return to his native land.A. It is long before thatB. It is before long thatC. It wont be long beforeD. It will be long before3. _he returns to his native land.A. It is long before thatB. It is before long thatC. It wont be long beforeD. It will be long before that4. _he returns to his native land.A. It is long before thatB. It i