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1、去百度文库,查看完整内容> 内容来自用户:泥越 现在完成时与过去完成时的区别I have finished my homework.I had finished my homework by 10:00 this morning.现在完成时1.表示过去发生的对现在有影响的动作;I have seen the film many times.2.表示过去某一时间开始一直延续到现在的动作。
2、He has lived here since 1949.过去完成时表示过去某一时刻以前已经开始并一直延续到这一时刻或在此刻前已经完成的动作,即“过去的过去”By the end of last term we had learned 1000 English words.现在完成时have/has+动词的过去分词主语为三人称单数,则用“has+过去分词”She has waited here for an hour.主语为非单三,则用“have+过去分词”I have waited here for an hour.过去完成时had +过去分词had可用于各种人称和数By the end of this termwe had learned 1000 English words.现在完成时的用法1.表示过去发生的某一动作对现在造成的影响或产生的结果(强调是过去动作与现在的联系,也就是强调现在的影响和结果)通常与表示与包括现在在内的时间副词just,already,before,yet,never,ever等状语连用eg.I haveneverheard of that before.She hasalreadyknown the news.2.表示过去某个时间开始的动作或存在的状态,一直持续到现在并可能还将持续下去。
3、动词使用延续性动词常与for或since引导的时间连用so far, by now, this days,。
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