现在完成时的概念、构成及用法 一、概念 现在完成时表示到说话时为止(或到现在为止)已经发生或完成了(不一定结束)的动作或状态。过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。 二、构成 现在完成时是由助动词 have(has)+动词的过去分词构成。助动词have(has)表明事情发生于现在。它和主语的人称、数要保持一致。过去分词在句子中做谓语,说明句子的含义。 三、用法 1. 动作发生在过去某个不确定的时间,但对现在有某种影响和结果。常被just、already、yet 等副词修饰。如: -Have you had lunch yet? -Yes, I have. I've just had it. 你(已经)吃午饭了吗? 我刚刚吃过。(现在我不饿了) 2. 表示从过去某一时刻开始一直持续到现在的动作或状态。这个动作可能刚停止,可能仍然在进行。常带有for和since等表示一段时间的状语。 如:He has taught here since 1981 他自1981年就在这儿教书。(可能还要继续教) I have't seen her for four years. 我有四年没见到她了。 3. 表示说话前发生过一次或多次的动作,现在成为一种经验,一般译为汉语“过”,常带有twice, ever, never, three times等时间状语。 如: I have been to Beijing twice.我去过北京二次。 四、现在完成时的时间状语 1. 现在完成时属于现在时范围,故不能和过去的时间状语连用。如:yesterday, last Sunday,in1990,three years ago等。但是,在强调动作产生的后果和影响时,可以和一些表示不确定的时间状语连用。 a. 用副词already和yet。already一般用于肯定句中,yet一般用于否定句和疑问句中。如:We have already finished our homework.我们已完成作业了。 1 / 3 They haven't finished their homework yet.他们还没有完成作业。 b.用ever 和never。多用于否定或疑问句中,表示“曾经”或“从未“等。 如:-Have you ever been to the Great Wall?你曾经去过长城吗? -I have never been to the Great Wall.我从未去过长城。 c.用表示到说话为止的过去时间状语,如just, before, up to now, the past few years等。 例如:I have seen her before, but I can not remember where. 我以前见过她,但记不起在哪里见过。 He has been there three times the last few days. 近几年他去过那里三次了。 d.用包括“现在”在内的时间状语,如:now, today, this morning(month, year, term)等。例如:-Have you met him today?-No, I haven't. 今天你见过他吗?我没有。 How many times have you been there this year? 今年你去过那里多少次? 2. 现在完成时可以和带有since或for等表示“一段时间”的状语连用,表示动作或状态从某一时刻开始,一直持续到现在。如:I haven't seen him for two years. 但是,像come, arrive, buy等终止性动词不能与表示“一段时间”的状语连用。要用,必须改为“be(在)”等延续性动词来表述。现归纳总结一下由非延续性动词到延续性动词的转换: arrive→be here begin(start)→be on die →be dead come back→be back leave →be away fall ill(sick, asleep)→be ill(sick,asleep) get up→be up go out →be out finish →be over put on →wear 或be on open →be open join →be in或 be a member of… close →be closed go to school→be a student borrow →keep buy →have catch(a cold)→ have(a cold) get to know →know begin to study→study come to work→work等 如:He has been a soldier for three years.他参军三年了。 His father has been dead for two years.他父亲去世二年了。 2 / 3 本文来源:https://www.wddqw.com/doc/c2b8ac54d5bbfd0a78567310.html