stress的用法总结大全
stress的用法总结大全
想知道stress的用法吗?今天给大家带来了stress的用法，希望能够帮助到大家，下面就和大家分享，来欣赏一下吧。
stress的用法总结大全
stress的意思
n. 强调,重音,压力,重力
vt. 重读,[机械学]使承受压力,给…加压力(或应力)
变形：过去式: stressed; 现在分词：stressing; 过去分词：stressed;
stress用法
stress可以用作动词
stress用作名词时基本意思是“重音”,转化为动词意思是“重读”。引申可表示“强调”。
stress只用作及物动词,可接名词、代词、that从句作宾语。
stress作动词时，和lay stress on一样，一般表示“强调”，有时表示“注重”。In his speech he stresses(或lays stress on)honesty
as an important virtue.他在演讲中强调诚实是一种很重要的美德。
stress用作动词的用法例句
Here I will stress the importance of mathematics to the whole of science.这里我要强调数学对整个科学的重要性。
In English, speakers can stress or emphasize words they think are important.在英语中，说话者可以重读或强调他们认为重要的单词。
stress用法例句
1、Massage is used to relax muscles, relieve stress and improve the circulation.
按摩可以使肌肉放松，缓解压力和促进血液循环。
2、Stress is widely perceived as contributing to coronary heart disease.
压力被广泛认为是导致冠心病的一个因素。
3、Stress, both human and mechanical, may also be a contributing factor.
来自人的和机械方面的压力可能也是一个因素。
你的stress用好了吗?
文字版
“冷静”第二天，需要学习的词汇是stress，同样是用法多样的词汇。
stress n. 紧张，压力;造成紧张的因素。请注意例句中高亮部分的用法。
例句1: People under a lot of stress may experience headaches, minor pains, and sleeping difficulties. 压力大的人可能会出现头痛、轻微疼痛和睡眠障碍。
例句2: Yoga is a very effective technique for combating stress. 练瑜伽是舒缓压力的非常有效的方法。
例句3: the stresses and strains of the job 工作的紧张和压力做动词时，意思是“紧张，焦虑，担心”。
例句：Dont stress over it - well soon get it sorted out. 不用担心——我们很快会解决的。
一个词组，stress sb out 令(某人)紧张;使(某人)焦虑不安。
例句：Interviews always stress me out.
面试总是令我非常紧张。
最新现在完成时讲解和练习(有答案)
现在完成时讲解和练习 1. 现在完成时的构成: have\has+过去分词(过去分词的构成有规则变化和不规则变化) 2. 现在完成时的四个基本句型 肯定句He has finished the work. 一般疑问句Has he finished the work? 回答Yes ,he has. No, he hasn’t. 否定句He has not finished the work. 特殊疑问句What has he done? 3.现在完成时的用法: A．表示过去发生或已经完成的动作对现在造成的影响或结果，强调对现在造成的影想或结果）。例如：The car has arrived. 车子来了。（结果：车子已在门口） Someone has broken the window.有人把窗户打破了。（结果：窗户仍破着） B. 表示过去已经开始，持续到现在的动作或状态，可以和表示从过去某一时刻延续到现在（包括“现在”在内）的一段时间的状语连用,如for+时间段、since+过去的时间点、疑问词how long等。例如： My uncle has worked at this factory for five years. 我叔叔在这个工厂工作已经五年了。 Mr. Black has lived in China since 2002. 自从2002年Mr. Black 一直住在中国。 How long have you been here? 你来这里多久了？ 4. 在下列情形下用现在完成时 (1)九词语 ①already已经肯定句中或句尾 e.g.: I have already found my pen. = I have found my pen already. ②yet已经否定句和疑问句句尾 e.g.：I have not finished the work yet. Have you bought a computer yet? ③ever曾经句中 e.g.：Have you ever seen pandas? ④never从不句中 e.g.：I have never been to Beijing. ⑤just刚刚句中 e.g.：I have just done my work. ⑥before以前句尾 e.g.：I have never been there before. ⑦so far到目前为止 e.g.：So far he has learnt 200 words. ⑧how long多久 e.g.：How long have you lived here? ⑨how many times多少次 e.g.：How many times has he been to Beijing? (3)三词组 1.have
when的用法总结大全
when的用法总结大全 when的用法你知道多少，今天给大家带来when的用法，希望能够帮助到大家，下面就和大家分享，来欣赏一下吧。 when的用法总结大全 when的意思 adv. 什么时候,(用于时间的表达方式之后)在那时,其时,当时conj. 在…时,既然,如果 pron. 什么时候,那时 n. 时间，时候,日期,场合 when用法 when可以用作副词 when的基本意思是“什么时候”。可用作疑问副词,用来询问某事曾发生或将要发生的时间,引导特殊疑问句; 还可用作关系副词引导限制性定语从句、非限制性定语从句和表语从句,表示“是…时候的事”。 when可用作从属连词,引导状语从句,表示时间时作“当…时,在…的时候”解; 表示条件时作“如果,要是”解; 表示对比时作“既
然,考虑到”解。当when所引导的从句的主语和主句的主语一致时,常将其主语、系动词或助动词省去,只留实义动词或表语,或者改写为短语。 when所引导的时间状语从句用一般现在时代替将来时,用现在完成时代替将来完成时。 when用作副词的用法例句 When did that happen?那件事是什么时候发生的? They stood respectfully when he entered the room.当他走进房间时，他们都恭恭敬敬地站着。 Iron will melt when it is made very hot.当铁烧得很热时就会熔化的。 when可以用作连词 when可用作从属连词,引导状语从句,表示时间时作“当…时,在…的时候”解; 表示条件时作“如果,要是”解; 表示对比时作“既然,考虑到”解。当when所引导的从句的主语和主句的主语一致时,常将其主语、系动词或助动词省去,只留实义动词或表语,或者改写为短语。 when所引导的时间状语从句用一般现在时代替将来时,用现在完成时代替将来完成时。
过去完成时态用法小结
过去完成时态的用法小结 默认分类2009-12-27 12:54:52 阅读281 评论0 字号：大中小订阅 一、过去完成时适用场合 1. 过去完成时表示在过去某一时间或动作以前已经完成了的动作。这个过去的时间常用by，before等介词短语或一个时间状语从句表示，也可以暗含在上下文中。 I had finished my homework before supper.我在晚饭前就把作业做完了。 The play had already started when we got to the theatre. 我们到剧场时戏已经开始了。 By the end of June they had treated over 10,000 patients. 到六月底他们已经治疗了一万多病人。 2. 过去完成时还可表示过去某一时刻之前发生的动作或状态持续到过去某个时间或还要持续下去，常与for，since等词连用。如： He had served in the army for ten years before he retired last year. 他在部队干了十年，去年退役了。 He told me that he had known her since he was a child. 他告诉我他从小就认识她。 He had learned English for eight years before he went to England for further study. 他在去英国深造前，已学了八年英语。 3. 在一段情景连贯的文字中，先发生的事放在后面叙述时，要用过去完成时。如： Tom flew home, but his father had already died. 汤姆乘飞机回家，他的父亲却已经去世了。4. 过去完成时也用于hardly...when..., no sooner...than..., It was the first time + that分句等一些固定句型中。 He had no sooner left the room than they began to talk about him. 他刚离开房间，他们就议论起他来。 We had hardly begun when we were told to stop. 我们刚开始就被叫停。 It was the first time that he had ever spoken to me in such a tune.他用这样的语调跟我讲话，这是第一次。 二、过去完成时与一般过去时的比较 1. 当一个由before, after, as soon as 等连词引导的从句所表示的动作和主句的动作紧接着发生时，两个动作均可用一般过去时来表示。 We had breakfast after we did morning exercises. 做完早操后，我们吃早饭。 The train started to move just before he reached the platform. 他到月台时火车刚开走。 They started ploughing as soon as they got to the fields. 他们一到地里就开始耕地。 2. 按时间顺序叙述两个或两个以上接连发生的动作时，用一般过去时。 He entered the room, turned on the light and sat down at the table. 他走进屋子，打开灯，坐在桌子旁。 3. 在表示某人过去未曾完成的“心愿”、“打算”、“计划”、“想法”、“许诺”等时，hope, mean, plan, think, intend等谓语动词常用过去完成时。 I had hoped to be back last night, but I didn’t catch the train. 我本来希望昨晚回来的，但没搭上火车。 We had thought to return early but they wouldn’t let us go. 我们本想早回来的，但他们不让我们走。 4. 在表示过去的句子中出现常与完成时态连用的词，如：already，yet，since，for，ever，never及次数名词等时，常用过去完成时来表示。
when做并列连词的用法
when 和引导时间状语从句的从属连词when 是不同的。这主要表现在以下几个方面： 1. 位置：when 引导时间状语从句时，该从句可放在主句之前也可放在主句之后；而并列连词when 只能位于两个分句之间，而且前面常常有逗号。例如：Come when you please. 你高兴来就来吧。（when 为从属连词）When I saw him，he was writing to a friend of his. 我看见他时，他在给一个朋友写信。（when 为从属连词）I was taking a walk，when I came across him. 我正在散步，突然碰见了他。 2. 意义：when 作从属连词用时，它所引导的从句表示主句中谓语动词动作发生的时间，即作“当……时”解；而并列连词when 连接的两个分句中，第一个分句表示的是背景，第二个分句表示的是一种突然的、意想不到的情况或过早发生的事情。when 通常含“这时突然”之义。例如：I was thinking of this，when I heard my name called. 我正想着这件事，突然听到有人叫我的名字。I had just fallen asleep，when the boor-bell rang. 我刚入睡，门铃突然响了起来。这种意义在孤立的句子中可以理解到，在文章中更能体会得到。如在“ I was wandering through the street when I caught sight of a tailor's shop ”一句中，“在街头漫步”只是“看见有家缝纫店”的时间，其后作者怎样走进缝纫店，想要什么样的衣服，怎样受到伙计的奚落，又怎样受到老板的奉承等情景均与“漫步街头”没有直接的因果关系。 3. 时态：when 引导的时间状语从句中可以根据句意的需要用一般现在时.一般过去时、过去进行时、分别说明现在，过去，甚至将来的行为；并列连词when 后面的分句中通常用非延续性动词的一般过去时，其前表时间的分句中可用：（ 1 过去进行时表示过去某时间正在进行的动作。 例如： I was cooking when I heard her knocking at the door. 我正在做饭，突然听到她敲门的声音。 He was thinking about the problem，when an apple fell to the ground. 他正在思考这个问题，突然有一只苹果掉到了地上。 （2 ）was /were going to，was / were about to，was / were on the point of 表示过去某一时间将要发生的动作。 例如： I was just going when he came in. 我正要走，这时他就进来了。 We were about to start when it began to rain. 我们刚要动身天就开始下起雨来了。 He was on the point of leaving，when someone knocked at the door. 他刚要走就有人敲门。 （3 ）过去完成时表示过早发生的事情。请看下述两种场合： （a ）过去完成时和含否定意义的hardly，scarcely，nearly 连用，和just，little 连用，或者与否定词not 连用时，表示“刚……，就……”的意思。 例如： I had hardly opened the door when he hit me. 我刚一开门他就打了我一下。 I had nearly reached the town，when the young man suddenly said very slowly，“ Do you speak English ”我快要进城了，年轻人突然慢慢地说：“你会讲英语吗” I had been there little more than a week when I set to work in earnest. 我到那儿还不超过一个星期就开始认真干起活来。 I had not been reading for half an hour when I heard steps outside.
现在完成时的用法解析
Lead in 一般过去时导入：一般过去时的概念 一般过去时表示过去某个时间发生的动作或存在的状态。 I lost my pen.(过去时) I have lost my pen.（现在完成时） 过去时一般表示过去所发生的动作或存在的状态。“我把笔丢了”，说话人只是想告诉对方在过去的某一个时间里他的笔丢了，仅此而已。（仅仅是在陈诉过去的一个事实，与现在没有关系） New lesson 一．现在完成时的构成： 助动词have/has(not) +动词过去分词 She has turned on the lights. 肯定式：have/ has+过去分词 否定式：haven’t/hasn’t+过去分词 疑问式：把have/has 提到主语前面 肯定回答：Yes,…have/has 否定回答：No,…..haven’t/hasn’t 二．用法 1.表示过去发生的动作对现在造成的影响或结果. 例如:She has gone. 她走了. She went in the past.(She is not here
now.) I have just cleaned my hands. 我刚洗过手。（“洗手”是发生在过去的动作，对现在造成的结果是“手干净了”） I have closed the door. (The door is close now.) She has turned on the lights. (The lights are on now.) He has written his name on the blackboard. (The name is on the blackboard now.) Mother has cooked the dinner. (We can have dinner now.) You have seen the film. （You know what the film is about.) We have cleaned the classroom. (The classroom is clean now.) 2. 表示动作发生在过去，并且一直延续到现在，甚至还可能继续延续下去。这时常和since所引导的短语或从句或for引导的短语连用(for有时可以省去)。以及so far, by now, these days, in the last/past … years/days…等连用。 I have lived here for over ten years. （表示他现在还在这里居住，并且还有可能继续住下去）比较：I lived here ten years ago.(仅仅说明了他十年前在这里记住过的事实,不代表现在他还住在这里) He has studied here since 2006. 都用How long 提问，例： We have learned English for three years. We have learned English since three years ago.
过去完成时知识点总结和题型总结(word)
过去完成时知识点总结和题型总结（word） 一、初中英语过去完成时 1．—We all went to the park except you last weekend. Why didn't you come? —Because I the park twice. A. have gone to B. had gone to C. had been to D. have been to 【答案】 C 【解析】【分析】have gone to去了（尚未回）．have been to去过（已回），根据句意在last weekend之前去过，所以用过去完成时，故选C。 【点评】本题考查过去完成时的用法，表示在过去某一时间前已经发生的动作。 2．Sue didn't go to see the film with us last week because she ________________ it with her mother. A. has seen B. had seen C. will see D. saw 【答案】 B 【解析】【分析】句意：苏上星期没和我们一起去看电影，因为她和她妈妈一起看过了。 A.已经看了，现在完成时； B.已经看了，过去完成时； C.将看，一般将来时； D.看了，一般过去时。Sue和妈妈看了电影的影响是上周Sue没有和我们看电影，所以用完成时，根据didn't可知是与过去有关，所以用过去完成时，结构是had+动词过去分词，see的过去分词是seen，故选B。 【点评】考查过去完成时，注意平时识记其结构，理解句意。 3．Jake _____his key in the office so he had to wait until his wife _______ home. A. has forgotten … comes B. forgot… come C. had left… came D. had left…would come 【答案】 C 【解析】【分析】句意：杰克把他的钥匙丢在办公室了，因此他不得不等到他的妻子回家。结合语境可知前文描述的是过去某时前已经完成的动作，故用过去完成时态。下文指的是过去某时的动作，故用一般过去时态。选C。 【点评】英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型，首先要注意句子中的时间状语，如果没有则要通过分析上下文，结合语境来判断句子的时态。 4．When I ______ the cinema, the film _______for ten minutes A. got to; has begun B. arrived at; has been on C. reached; had begun D. hurried to; had been on
when-的用法
when 的用法 一、when 用作副词。 1. 用作疑问副词，引导特殊疑问句。(什么时候，何时 [at what time ])例如： ①When will you come to see me? ②When are they going to visit the Great Wall? 2. 用作连接副词，通常用来引导名词性从句[主语从句、表语从句、同位语从句、宾语从句]及起名词作用的“when ＋动词不定式”结构。(什么时候，何时 [at which; on which ])例如： ①When he comes is not known. [主语从句] ②The morning is when I am busiest. [表语从句] ④I don't know when the plane takes off. [宾语从句] ⑤I don't know when to leave for London. [宾语] 3. 用作关系副词，引导限定性定语从句和非限定性定语从句。(在…的时候 [at/on/in/during which])例如： ①Do you still remember the days when we stayed in America? ②The day will come soon when the Chinese astronauts will go to the moon. ③It happened ten years ago, when I was a child. ④We will go to the countryside at the beginning of June, when the summer harvest will start. 二 . when 用作连词。 1. 用作从属连词，意为“当……的时候[at the time when ]”，引导时间状语从句。例如： ①They learned a lot from the peasants when they stayed in the village. ②It was snowing when he arrived at the station. 【点津】如果 when 引导的从句中的主语和主句中的主语一致，且从句中的谓语动词是“be ＋分词”或从句主语是 it ，则 be 动词及其主语常可省略。例如： ③When（ he was ）asked why he was late, he made no answer. ④I'll tell him about it when（ it is ）possible. 2. 用作从属连词，意为“一……就……”，引导时间状语从句。[immediately after]例如： ①We will stand up when the teacher comes into the classroom. 老师一进教室我们就起立。 ②Fire the rockets when I give the signal. 3. 用作从属连词，意为“还没 / 刚刚/刚一……就”，引导时间状语从句。[immediately after]例如： ①I had hardly opened the door when he came in. 我刚一开门，他就进来了。 ②I had not been reading for half an hour when I heard someone call my name. 【点津】hardly…when和no sooner…than的结构要注意三点：意思为“一A就B“；A句通常用完成时态；hardly 和 no sooner 位于句首时要注意部分倒装。 4. 用作从属连词，意为“倘若，如果”，表示条件。例如： ①Turn off the switch when anything goes wrong with the machine. 如果机器发生故障，就把电源关上。 ②He will be likely to recover when he is operated on. 5. 用作从属连词，意为“既然，尽管”，表示让步。例如： ①Why use metal when you can use plastic?既然能用塑料,为什么用金属? ②They kept trying when they knew it was hopeless. 尽管他们知道那件事没有希望，可是他们还在不断地努力。6. 用作并列连词，意为“在那时，届时;就在这时”，表示时间。这时主句中可以用过去进行时，过去完成时或“ was/were about to do sth. ”结构。 ①Last night I was about to go to bed when the phone rang. ②I was cooking in the kitchen when someone knocked at the door. ③He had just finished the book when supper was served. 7. 用作并列连词，意为“虽然、然而、可是”，表示转折。例如： ①He usually walks to work when he might take a bus. 虽然他可 以坐公共汽车上班，但他却常常步行上班。 ②I had only twenty dollars when I needed thirty to buy the dictionary.我需要 30 美元买那本字典，可是我只有20美元。 8. 用作并列连词，意为“而、却”，表示对比。例如： How can he say that everything is fine when it's obvious that it is not? 他怎能说一切都好呢？情况显然不是那样。 三 . when 用作代词[which time]。 when 作为代词常常位于介词之后，意为“那时，什么时候”。例如： ①Since when have you been studying Japanese? 【点津】since when 作引导词时是“介词（since）+关系代词（when）”的结构，when意为which time。since when常引导非限制性定语从句，从句应用完成时态。 ②I came here in 1949, since when I have been engaged in this work. 我1949年到这里，从那时起我就担任这项工作。 ③We came back on Tuesday, since when we have been working in the repair shop. ④We came a week ago, since when the weather has been bad. 四、when 还可用作名词，前面常常用定冠词 the。 the when 表示事 件发生的时间,常常与 the where, the how 并列使用。 He told the police the when and the how of the accident. 他告 诉警察事故发生的时间及发生的原委。 ［巩固练习］ 1. I remember ______ this used to be a quiet village. A. when B. how C. where D. what 2. Why do you want a new job _____ you've got such a good one already? A. that B. where C. which D. when 3. It was an exciting moment for these football fans this year, ______ for the first time in years their team won the World Cup. A. that B. while C. which D. when 4. We are living in an age _______ many things are done on computer. A. which B. that C. where D. when 5. The reporter said that the UFO ______ east to west when he saw it. A. was travelling B. travelled C. had been travelling D. was to travel 6. ______ got into the room _________ the telephone rang. A. He hardly had; then B. Hardly had he; when C. He had not; than D. Not had he; when 7. ---- Can I join your club, Dad? ---- You can when you _______ a bit older. A. get B. will got C. are getting D. will have got 8. I shall never forget those days ________ I lived in the countryside with the farmers, ________ had a great effect on my life. A. that; which B. when; which C. which; that D. when; who 9. The film brought the hours back to me ______ I was taken good care of in that faraway village. A. until B. that C. when D. where 10. He was about to tell me the secret ______ someone patted him on the shoulder.
(英语语法)四种完成时态
LESSON EIGHT 四种完成时态 主系表 现在：You are rich. 过去：You were rich. 将来：You will be rich. 过去将来：You would be rich. There be 现在：There is a book on the desk . 过去：There was a book on the desk. 将来：There will be a book on the desk. 过去将来：There would be a book on the desk.主谓宾状 现在：You study English in the school. 过去时：You studied English in the school. 将来时: You will study English in the school. You are going to study English. You are to study English. are about to study English would study English in the scho You were going to study English. You were to study English. You were about to study English. You are studying English. You were studying English. You will be studying English. You woud be studying English.
并列连词when相关的句式归纳
并列连词when相关的句式归纳 2006年普通高等学校招生全国统一考试(辽宁卷)中有这样一道单项填空题:He was about halfway through his meal ___ a familiar voice came to his ears. A.why B.where C.when D.while 解析:答案是C。此处when作并列连词,表示“就在此刻(and just then)”“,突然(and suddenly)”,该句译为：“饭刚吃到一半儿的时候，熟悉的声音传到了他的耳朵里。” 这里when引导的并不是我们所认为的时间状语从句而是并列句。when的意思是这时而不是当什么时候。在这个句型中when所引导的从句恰恰是句意的重心，when在这里起到一个修辞的作用表示后一动作的发生的出乎意料，而前面一句是为后一句谓语动词的发生提供背景。when 为并列连词。在我们的教材中并不鲜见。如： I'd just about given myself up for lost when I was spotted by a ship. 我正感到绝望时，一艘船发现了我。【Unit 3 Book 3】 33. She had just finished her homework ___ her mother asked her to plactised playing the piano yesterday.【09福建卷】 A. when B. while C. after D. since 7. Tom was about to close the window ___ the attention was caught by a bird. 【10全国卷】 A. when B. if C. and D. till 1．be (just) about to do... when... She was just about to say something more when she noticed the sullen look on his face．她刚要再说些什么，却突然看到了他阴沉的脸色。 We were about to telephone you when your telegram arrived. 2．be (just) on the point of doing sth ... when... They were on the point of giving up when the captain encouraged them fiercely to save the ship． 就在他们快要放弃努力时, 船长鼓励他们竭尽全力挽救轮船。
英语过去完成时的用法总结
英语过去完成时的用法总结 它表示句子中描述的动作发生在“过去的过去”。 基本结构 主语+had+过去分词vpp、(done) ①肯定句：主语+had+过去分词、 ②否定句：主语+had+not+过去分词、 ③一般疑问句：Had+主语+过去分词? 肯定回答：Yes,主语+had、 否定回答：No,主语+had not 、 ④特殊疑问句：特殊疑问词或词组+一般疑问句（Had+主语+过去分词）？ 基本用法表示在过去某一时刻或动作以前完成了的动作，也可以说过去的时间关于过去的动作。即“过去的过去”。可以用by, before等介词短语或一个时间状语从句来表示，也可以用一个表示过去的动作来表示，还可能通过上下文来表示。 例如： By nine o’clock last night, we had got200 pictures from the spaceship、到昨晚9点钟，我们已经收到200 张飞船发来的图片。 过去完成时-语法判定 1、由时间状语来判定
一般说来，各种时态都有特定的时间状语。与过去完成时连用的时间状语有： （1 ） by + 过去的时间点。如： I had finished reading the novel by nine oclock last night、 （2 ） by the end of + 过去的时间点。如： We had learned over two thousand English words by the end of last term、 （3 ） before + 过去的时间点。如： They had planted six hundred trees before last Wednesday、 2、由“过去的过去”来判定。 过去完成时表示“过去的过去”，是指过去某一动作之前已经发生或完成的动作，即动作有先后关系，动作在前的用过去完成时，在后的用一般过去时。这种用法常出现在： （1 ）宾语从句中 当宾语从句的主句为一般过去时，且从句的动作先于主句的动作时，从句要用过去完成时。在told, said, knew, heard, thought等动词后的宾语从句。如： She said that she had seen the film before、 （2 ）状语从句中
连词when的用法
一、作为副词，它有以下的用法： 1. 作为疑问副词，引导特殊疑问句，意为“什么时候；何时”。 （1 ）When will they come back？ （2 ）What time will they come back？ 回答when 引导的从句，不一定指出具体的时间点。如回答句（ 1 ）可用tomorrow，next month 等。而回答what time 引导的问句，则必须说出具全的时间点，如at two o'clock，at five past ten 等。 2. 作连接副词，引导名词性从句或不定式，意为“什么时候”。从句使用陈述句语序，时态根据实际情况而定。 （1 ）I'd like to know when they will come. 我想知道他们什么时候来。（when 引导宾语从句） （2 ）Can you tell me when the bank opens？你能告诉我银行什么时候开门吗？（when 引导宾语从句） （3 ）When she'll be back depends much on the weather. 她何时回来在很大程度上取决于天气。（when 引导主语从句） （4 ）Have you decided when to go sightseeing？你们已经决定什么时候去郊游了吗？（when 引导不定式结构） 3. 作疑问代词，常和介词since，till，up to 等连用，意为“什么时候”。 如：（1 ）Since when have they had the house？他们从什么时候起有这幢房子的？（2 ）Till when is the library open？图书馆开放到几点呢？ 4. 作关系副词，引导限制性定语从句和非限制性定语从句。 （1 ）The days are gone forever when the Chinese people were looked down upon. 中国人民被人轻视的日子一去不复返了。 （2 ）The main school holidays are from mid-December till early February，when the days are long and warm. 学校的主要假期是从12 月中旬到2 月初，这段时间里白天长而且很温暖。 （3 ）Considering （the time）when these paintings were done，they are in excellent condition. 考虑到这些油画的创作时期，它们保存的状况是极好的。 （4 ）Do you remember （the time）when the three of us went on a picnic？你还记得我们三个人去野餐的那段时光吗？ A. 在定语从句中，that 在某些条件下可用来代替when ，这时其先行词通常是time，
过去完成时用法小结
过去完成时用法小结 一、过去完成时适用场合 1. 过去完成时表示在过去某一时间或动作以前已经完成了的动作。这个过去的时间常用by，before等介词短语或一个时间状语从句表示，也可以暗含在上下文中。 I had finished my homework before supper.我在晚饭前就把作业做完了。 The play had already started when we got to the theatre. 我们到剧场时戏已经开始了。 By the end of June they had treated over 10,000 patients. 到六月底他们已经治疗了一万多病人。 2. 过去完成时还可表示过去某一时刻之前发生的动作或状态持续到过去某个时间或还要持续下去，常与for，since等词连用。如： He had served in the army for ten years before he retired last year. 他在部队干了十年，去年退役了。 He told me that he had known her since he was a child. 他告诉我他从小就认识她。 He had learned English for eight years before he went to England for further study. 他在去英国深造前，已学了八年英语。 3. 在一段情景连贯的文字中，先发生的事放在后面叙述时，要用过去完成时。如： Tom flew home, but his father had already died. 汤姆乘飞机回家，他的父亲却已经去世了。4. 过去完成时也用于hardly...when...（刚…就…）, no sooner...than... （刚…就…）, It was the first time + that分句等一些固定句型中。 He had no sooner left the room than they began to talk about him. 他刚离开房间，他们就议论起他来。 We had hardly begun when we were told to stop. 我们刚开始就被叫停。 It was the first time that he had ever spoken to me in such a tune.他用这样的语调跟我讲话，这是第一次。 二、过去完成时与一般过去时的比较 1. 当一个由before, after, as soon as 等连词引导的从句所表示的动作和主句的动作紧接着发生时，两个动作均可用一般过去时来表示。 We had breakfast after we did morning exercises. 做完早操后，我们吃早饭。 The train started to move just before he reached the platform. 他到月台时火车刚开走。 They started ploughing as soon as they got to the fields. 他们一到地里就开始耕地。 2. 按时间顺序叙述两个或两个以上接连发生的动作时，用一般过去时。 He entered the room, turned on the light and sat down at the table. 他走进屋子，打开灯，坐在桌子旁。 3. 在表示某人过去未曾完成的“心愿”、“打算”、“计划”、“想法”、“许诺”等时，hope, mean, plan, think, intend等谓语动词常用过去完成时。 I had hoped to be back last night, but I didn’t catch the train. 我本来希望昨晚回来的，但没搭上火车。 We had thought to return early but they wouldn’t let us go. 我们本想早回来的，但他们不让我们走。 4. 在表示过去的句子中出现常与完成时态连用的词，如：already，yet，since，for，ever，