2022年高考英语人教版第二轮复习知识点精讲06动词的时态和语态(三).docx
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1、完成时 完成时是用来表示动作的完成与未完成的情况。完成时包括现在完成时、过去完成时和将来完成时。一、现在完成时1. 现在完成时的用法表示结果的现在完成时 现在完成时着眼于过去的动作对现在产生的结果或影响。这是现在完成时的“已完成”用法,表示动作或过程发生在说话之前就已完成,并与现在有联系。这种联系实际上就是“过去的动作”对现在的影响或产生的结果。I have bought a pen. 我买了一支笔。(结果:I have a pen now.) The temperature has increased by 10. 温度上升了10摄氏度。(结果:It is quite hot now.) A
2、ir pollution has taken the lives of many people. 空气污染已经夺去了很多人的生命。(结果:Air pollution is very serious now.) 注意: 现在完成时的上下文所指的时态必须呼应。 【误】I have bought a pen but I have lost it now.(have bought表示你现在已经有笔了,这和后面的have lost有矛盾) 【正】I bought a pen but I have lost it now. 我(过去)买了一支笔,但我已经把它丢了。 【误】I have lost my pe
3、n but I have found it now.(have lost强调你现在已经没有笔了,与后面have found的意思有冲突) 【正】I lost my pen but I have found it now. 我丢了一支笔,但现在已经找到了。表示经历的现在完成时:强调过去某一时刻到说话时这段时间中的经历。 Have you ever been to the Great Wall?你去过长城吗? I have visited Beijing at least ten times.北京我至少访问过十次了。 She has never spent a holiday at the sea
4、side.她从未到海滨度过假。表示延续的现在完成时 这是现在完成时的“未完成”用法,表示一个动作或状态从过去某时开始,持续到现在,可能要继续下去。 Hes loved fishing for a long time.他爱好钓鱼为时已久。(他现在仍爱好钓鱼) I have lived here for more than thirty years. 我已在这儿住了三十多年了。(也许还会继续住下去)注意: 现在完成时的“未完成”用法既可用于动态动词(主要是持续动词),也可用于状态动词,但它一般不适用于表示短暂动作或位置转移的动词,如:open, break, go, come, arrive, l
5、eave等。如用这类动词表示“未完成”,通常只限于否定结构。 I havent seen a film for weeks.我已经好几个星期没看电影了。 She hasnt written to me since September.自从9月份以来她还没给我写过信呢。2. 现在完成时的时间状语与现在完成时“已完成”用法连用的时间状语 现在完成时表示的动作或状态发生在现在时间以前的某个未明确指出的过去时间内,和它连用的时间状语要与现在时间有关,不能是明确地表示过去的时间状语。 a. 不确定的过去时间状语:already, yet, before, recently, lately等 Ive se
6、en the film before.我以前看过这部电影。 Have you been there lately?近来你去过那里吗?b. 频度时间状语:often, sometimes, ever, never, once, rarely 等 We have never heard of that.我们从未听说过这事。 He has sometimes played tennis.他有时打网球。 Big Ben has rarely gone wrong.大本钟很少出差错。c. 包含现在时间在内的时间状语:now, just, today, this morning, this week, t
7、his year等 I have just finished the letter now.我现在刚写完信。You have just missed the bus.你刚好错过公共汽车。 Has he done much work today?他今天做了很多工作吗?比较:already和yet用法上的区别 already常用于肯定句,置于句中。yet常用于否定句和疑问句,置于句末。但already有时也可用在疑问句中暗示惊讶的心情。 She has already gone.她早就走了。 Have you eaten your dinner already?你已经吃过饭了? He has no
8、t come yet.他还没有来。与现在完成时“未完成”用法连用的时间状语 与“已完成”用法一样,表示具体的过去的时间状语不能与“未完成”用法连用。与其连用的往往是指一段时间的状语以具体表示某一动作或状态持续了多久。a. since + 具体时间,表示动作或状态从何时开始 Since then, he has developed another bad habit. 自那以后他养成了另一个坏习惯。 He hasnt been home since he graduated. 他毕业后就没回过家。b. for + 一段时间,表示动作或状态持续了多久 We have worked here for
9、 ages.我们在这里工作很久了。 There has been no rain here for nearly two months. 这里已经近两个月没有下雨了。c. until now, up till now, so far, up to the moment到目前为止 I have not seen him so far.到目前为止我没见过他。 Up to the present, everything has been OK.到目前为止一切正常。d. in/during the past/last five years在刚刚过去的5年里 He has been away from
10、school during the last few weeks. 过去的几个星期里他没在学校。 In the past few years they have dealt with quite a few international corporations successfully. 在过去的几年中他们已经和好几家跨国公司做成了生意。e. all the while, all day 一直,一整天 She has been busy all day. 她忙了一整天。 【易混辨析】 现在完成时和一般过去时的区别两者都可表示过去发生过的动作,但前者表示的是过去的动作对现在的影响,而后者则只是表
11、示过去有 这一动作的事实。 He locked the door.他锁过门。(但现在门是开是锁不清楚。) He has locked the door.他把门锁上了。(现在门是锁着的。) Who turned on the light?谁开的灯?(着眼开灯的动作,不管现在灯是开是关。) Who has turned on the light?谁把灯打开了?(着眼开灯的结果,即现在灯还亮着。)两者都可表示过去开始并延续了一段时间的动作,现在完成时表示该动作仍在继续,而一般过去时则说 明该动作现已终止。 He has lived in Beijing for four years. 他在北京住了四
12、年了。(现在仍住那儿) He lived in Beijing for four years. 他曾在北京住了四年。(现在不住那儿了)二、 过去完成时 过去完成时的动作须在过去某一时间之前发生,即发生在“过去的过去”。1. 过去完成时的用法“已完成”用法 表示某一动作或状态在过去某一时间之前或过去某一动作之前已经完成。句中常用by引导的时间状语或以 before, until, when, than等词引导的内含一般过去时的时间状语从句。 By 5:00 yesterday morning we had done that work.到昨天早上5点钟时,我们已经做完了那件工作。 He had
13、just finished sweeping the classroom when the teacher returned from the office. 老师从办公室回来时,他刚把教室打扫完。 They came earlier than we had expected. 他们到得比我们预料的要早。 I had learnt 5000 words before I entered the university. 我在进大学之前就已学了5000个单词。It rained yesterday after it had been dry for many months. 旱了好几个月之后,昨天
14、下雨了。注意: 在包含before和after的复合句中,因为从句动作和主句动作发生的先后顺序已经非常明确,可以用一般过去时代替过去完成时。 The train (had) started before I reached the station. 在我到达车站之前,列车已经开了。 After he (had) arrived in England, Marx worked hard to improve his English. 马克思到达英格兰之后,努力提高他的英语水平。“未完成”用法 表示一个动作或状态在过去某一时刻之前就已开始,一直持续到这一过去时间,还可能再持续下去。 Up to t
15、hat time all had gone well.直到那时一切都很顺利。 John and Jane had known each other for a long time before their marriage. 约翰和简在结婚前就认识很长时间了。 She said she had made much progress since she came here. 她说自从她到这儿后已取得了很大的进步。 “想象性”用法 过去完成时有时表示一种未实现的愿望或想法,主要用在if引导的和过去事实相反的条件句以及wish, as if引导的从句中。 If she had worked hard
16、, she would have succeeded. 要是她努力的话,她就会成功了。(事实上她没努力,也没成功。) I wish I had gone with you to the concert. 我要是和你一起去音乐会就好了。 The two strangers talked as if they had been good friends for many years. 那两个陌生人交谈起来就像是多年的老朋友。表示“刚刚就” 过去完成时常用在hardly/scarcely/barely . when., no sooner . than . 等结构中,表示“刚刚就”。 Hardly
17、had he begun to speak when the audience interrupted him. 他刚开始演讲,听众就打断了他。 No sooner had he arrived than he went away again. 他刚到就又走了。注意: intend, mean, hope, want, plan, suppose, expect, think等动词的过去完成时可以用来表示一个本来打算做而未做的事。 I had meant to come, but something happened.我原本打算来的,但有事发生了。 I had intended to call
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