内容正文:
专题01 语法知识串讲1(过去进行时、现在完成时、时间状语从句)(期末复习讲义)
语法点
常考题型
命题趋势
过去进行时
现在完成时
时间状语从句
单项选择
语法选择
语法填空等
1.注重素养:更加注重对学生英语核心素养的考查。
2.情境化突出:借助生活、学校、社会等多种情境,将语法考察与实际生活相结合。
3.文化传承与价值导向明显:注重选取具有文化内涵和思想价值的语篇。
过去进行时
知识点01 谓语构成:由“助动词be的过去形式(was/were)+v-ing”。
知识点02 各种句式变化:否定形式是在be(was/were)后加not。
一般疑问句是把be(was/were)放到句首。如:
He was not waiting for me at that time.
---- Was he waiting for me at that time? ---- Yes, he was.(No he wasn’t)
知识点03 过去进行时的用法
① 表示过去某一时刻正在进行或发生的动作。
② 表示过去某一段时间内一直在做或持续进行的动作。
③ 在复合句中,若主要动作和背景动作是同时发生的,那么主从句都可用过去进行时。如:
④ 表示从过去某一时间看来将要发生的动作,尤其是come, go, leave, start, begin, move等表示位置移动和起止的动词。
⑤ 与现在进行时相似,过去进行时也通常与 always, forever, continually等副词连用,表示满意、称赞、惊讶、厌恶等感情色彩。
1.They TV at ten o’clock last night. 昨晚十点他们在看电视。
2.I dinner when my husband got home yesterday afternoon. 我丈夫昨天下午到家时,我正在做晚饭。
3.What yesterday evening? 昨天晚上你一直在干些什么?
4.He his homework between 8:00 and 9:00 on Sunday morning. 星期日八点到九点他一直在做作业。
5.Mary some reading while her younger brother was writing. 玛丽在看书,此时,她弟弟在写字。
6.She told me she Beijing next week. 她告诉我她下周动身去北京。
7.We two always . 我们俩老是吵架。
8.The boy continually questions. 这孩子总是问东问西的。
知识点04 过去进行时常见的时间状语
① 过去进行时常与过去某一特定时间状语连用。常见的时间状语有:last night, at that time, at noon
② 也有时在没有时间状语的情况下,需要通过上下文的暗示或者在同一个句子中的推理来判定用过去进行时。如:yesterday, last Sunday等。
1.I was reading a book . 在那时我在看书。
2.I was watching TV . 昨晚八点钟的时候我在看电视。
3. , we all knew what we were studying for. 那时,我们都知道为什么而学习。
知识点05 when和while的区别:
① 引导时间状语从句时,while 连接的是时间段,后常接延续性动词;而when连接的既可以是延续性动词也可以是非延续性动词。
② while可以连接两个并列的句子,而when不可以。
③ when可作特殊疑问词,对时间进行提问;while 不能。
1. were you born? 你是什么时候出生的?
2.What was your father doing your mother was cooking?你妈妈做饭的时候,你爸爸在干什么呢?
3.What was your mother doing you came back? 当你回来时,你妈妈在干什么呢?
4.I was trying my best to finish my work my sister was watching TV. 我当时正在尽力完成作业,而我的妹妹正在看电视。
易|错|点|拨
过去进行时和一般过去时的用法比较
① 过去进行时往往表示动作的未完成性,而一般过去时则往往表示动作已完成。
②过去进行时侧重说明动作持续时间的长度,而一般过去时则侧重说明事实。
1.He his homework in the afternoon. (没有言明作业是否完成)
2.He his homework in the afternoon. (作业已做完)
3. It all night. (只说明下雨事实)
现在完成时
知识点01谓语构成
由“助动词have/has + 过去分词”构成。在人称代词后have, has可以缩写为’ve或’s, have not
缩写haven’t, has not 缩写hasn’t。
知识点02各种句式变化
否定形式是在have/has后加not。一般疑问句是把have/has放到句首。如:
He has eaten breakfast. // He hasn’t eaten breakfast. //---- Has he eaten breakfast? ---- Yes, he has. (No, he hasn’t.)
【注意】过去分词变化规则基本与过去式变化相同,有些特殊变化需单独记忆。
知识点03 现在完成时的用法
1 表示在说话之前已经完成或刚完成的动作对现在产生的影响或结果,常与already, ever, never, just, yet, before 等词连用。
② 表示动作从过去开始持续到现在,或还有可能持续下去的动作或状态。常与for和since引导的短语或从句连用。动词必须是延续性动词。
1.I have just a ten-speed bicycle.
2.They have already the classroom.
3.We have here since 1976.
4.They have for more than two hours.
知识点04一般过去时与现在完成时的区别
一般过去时表示过去某时发生的动作或单纯叙述过去的事情,强调动作;现在完成时为过去发生的,但强调过去的事情对现在的影响,强调的是影响;一般过去时常与具体的过去时间状语连用。现在完成时属于现在时态范围,因此不能和表示过去时间的状语连用。试比较:
I saw this film yesterday.(强调看的动作发生过了,不涉及现在)
I have seen this film. (强调对现在的影响,电影的内容已经知道了。)
知识点05
瞬间动词,如come, go, arrive, die, buy, borrow, leave, join, marry, begin, finish, end等不能与for, since状语连用。但可以改变为其他表示相同意思的延续性动词。如:
误:The old man has died for a few years.
正:The old man has been dead for a few years. // The old man has been dead since a few years ago.
The old man died a few years ago. // It is a few years since the old man died.
A few years has passed since the old man died.
瞬间动词的变化:
瞬间性动词的完成时
→
延续性动词或状态动词的完成时
have
(already)
gone to…
have
for (two years)
has
come to…
has
since (1990)
(had)
left…
(had)
arrived…
died
begun
ended
bought...
borrowed…
joined…
知识点06 have/has been to, have/has gone to和have/has been in的区别:
have/has gone to意为“到某地去了”,说话时该人不在现场。一般只用第三人称作主语。have/has been to意为“曾经去过某地”,表示一种经历,含有“现在已离开那儿”之意,后可接次数(如once,twice,three times等)表示“去过某地几次”,也可和just,never,ever等连用。have been in表示“到某地多长时间了”,常与时间段连用。
1.I the Great wall. 我从未去过长城。
2.---- Where is Tom? ---- He the UK.(即现在不在这儿)
3.I Australia for three years. 我到澳大利亚已有三年了。
知识点07句型:
It is / has been + (多久)+ since + 主语(人)+谓语(过去时)+……+过去时间状语
[注意] 在其它的时态中也存在类似问题,记住,关键是:瞬间动词不能和表达一段时间的状语连用。
How long may I keep the book?(这本书我能借多久?)(句子中keep取代了borrow)
时间状语从句
知识点1 0时间状语从句表示时间
常用when;while;as;before;after;since;till/until;as soon as等连词来引导。时间状语从句中的谓语动词不能用一般将来时,只能用一般现在时表示将来发生的动作或存在的状态。
知识点02由when(在……的时候;当……的时候)引导的时间状语从句,可表示“时间点”或“时间段”,从句谓语可以是终止性动词,也可以是延续性动词。when可以指主句谓语动词和从句谓语动词所表示的动作同时或先后发生。
1. I got home, he was having supper. 当我回到家的时候,他正在吃饭。
2. he reached home, he had a little rest. 回到家以后,他休息了一会儿。
3. she came into my room, I was just reading a book. 她走进我房间时,我正在看书。
知识点03由while(当……的时候) 引导的时间状语从句,只可表示“时间段”,从句谓语只限于延续性动词。while强调主句谓语动词表示的动作持续于while从句所指的整个时间内;
1.Please listen to me carefully I read. 我读的时候请认真听。
2.I can listen to the radio I work. 我可以边听收音机边工作。
3. I was sleeping, my father came in. 我睡觉时,我的父亲进来了。
4.Father was cleaning the car I was playing computer games. 当我正在打电脑游戏时,爸爸在清洗汽车。
知识点04由as (当……的时候)引导的时间状语从句,表示的是一件事情正在发生,另一件事也正在进行当中。但与 while 从句不同的是,as 从句一般不用正在进行时,而只是一般过去时。as 从句一般可以翻译成“一边……一边……;与……同时”。as 表达的事件,往往只是主句动作发生的背景或条件时,as 只是一个次要的时间说明,不像while 从句有强调 while 动作本身的意思。因此,as也常翻译成“随着……”之意。as从句是终止性动词时,主句通常也必须是终止性动词。
1.The little girls sang they went. 小姑娘们一边走,一边唱。
2.The students took notes they listened. 学生们边听课边做笔记。
3. we talked on, he got more and more excited. 我们继续往下谈的时候,他越来越兴奋。
4. years go by, China is getting stronger and richer. 随着时间一年一年过去,中国变得越来越富强了。
知识点05由before(在……之前)和after(在……之后)引导的时间状语从句。注意before引导的从句不再用否定式的谓语,并且当before引导的从句位于主句之后,有时译成“就,才”。还要注意主句和从句之间的时间关系。当主句用将来时,从句总是用现在时;如果before引导的主句谓语用的是过去完成时,则从句动词多用一般过去时,这样以便体现动作发生的先后。after表示主句动作发生在从句动作之后。主句和从句的动作的时间关系正好与before引导的从句相反。
1.Einstein almost knocked me down he saw me. 爱因斯坦几乎把我撞倒才看到我。
2.My father had left for Canada just the letter arrived. 我父亲恰好在信到之前去加拿大了。
3. we had finished the work, we went home. 完成工作之后,我们回家了。(从句用过去完成时,主句用一般过去时)
4.I will go out to play basketball with you I finish my homework. 我做完功课后就和你一起出去打篮球。
知识点06由since(自从……以来)引导的时间状语从句。它的谓语动词可以是延续性的动词,又可以是瞬时动词。一般情况下,从句谓语动词用一般过去时,而主句的谓语动词用现在完成时。但在It is+时间+since从句的句型中,主句多用一般现在时。
1.I have been in Beijing you left. 自从你离开以来,我一直在北京了。
2.We have made many dumplings we began to cook. 自从我们开始做饭,我们已经包了许多饺子了。
3.It is four years my sister lived in Beijing. 我妹妹不在北京住有四年了。
4.It is five months our boss was in Beijing.我们老板离开北京有五个月了。
5. three years since we met last time. 自从我们上次见面,已经三年了。
知识点07由until/till(直到……为止;直到……才)引导的时间状语从句。一般情况下两者可以互换,但是在强调句型中多用until。需要注意的是:如果主句中的谓语动词是瞬时动词时,必须用否定形式,表示“直到……才”的意思,主句谓语动词一般用终止性动词,这时,till和until可用before替换;如果主句中的谓语动词是延续性动词时,用肯定或否定形式都可以,但表达的意思不同,until和till在肯定句中意为“直到……为止”。till不可以用在句首,而until可以放在句首。
1.I worked until he back. 我工作到他回来为止。
2.I work he came back. 他回来我这才开始工作。
3.We won’t start Bob comes. 直到鲍勃来我们才会开始。
4.He didn’t go to bed he finished his homework. 他直到做完作业才睡觉。(go to bed 表示的动作不能持续)
知识点08由as soon as引导的时间状语从句。表示“一……就……”,强调动作紧密相连。
1.We began t work we got there. 我们一到那儿,就马上开始工作。
2. I reach Canada, I will ring you up. 我一到加拿大,就给你来电话。
知识点09时间状语从句的时态:
一般来说时间状语从句的主句与从句的时态前后要一致。如果时间状语从句主句谓语动词用一般将来时,从句谓语动词常用一般现在时表示将来时间。
1.I will call you as soon as I there. 我一到达那儿就给你打电话。
2.Mozart started writing music when he four years old. (当)莫扎特四岁的时候,开始写音乐作品。
知识点10when引导的宾语从句和状语从句的区别:
when引导时间状语从句时,意为“当……时候”;引导宾语从句时,意为“什么时候”。
1.He asked we will hold the sports meeting. 他问我们什么时候开运动会。
2. the weather is fine, many families go out for a walk. 天气好时,很多家庭都出去散步。
3.---- Do you know he will come back tomorrow? 你知道明天他什么时候回来吗?
---- Sorry, I don’t. he comes back, I’ll tell you. 对不起我不知道,当他回来的时候,我就告诉你。
知识点11when,while和as的区别和联系:都可表示“当……的时候”,但用法有区别:
① when引导的从句的谓语动词可以是延续性的动词,又可以是瞬时动词。并且when有时表示“就在那时”。
1.When she , I stopped eating. 她进来时,我在吃饭。(瞬时动词)
2.When I in the countryside, I used to carry some water for him. 当的住在农村时,我常常为他担水。(延续性的动词)
3.We were about to leave when he in. 我们就要离开,就在那时他进来了。
知识点12 while引导的从句的谓语动作必须是延续性的,并强调主句和从句的动作同时发生(或者相对应)。并且while有时还可以表示对比。
1.While my wife the newspaper, I was watching TV. 当我妻子在看报纸的时候,我在看电视。(was reading是延续性的动词,was reading和was watching同时发生)
2.I like playing football while you basketball. 我喜欢踢足球,而你喜欢打篮球。(对比)
知识点13 as表示“一边……一边”,as引导的动作是延续性的动作,一般用于主句和从句动作同时发生;as也可以强调“一先一后”。
1.We always sing we walk. 我们总是边走边唱。(as表示“一边……一边”)
2. we was going out, it began to snow. 当我们出门时,开始下雪了。(as强调句中两个动作紧接着先后发生,而不强调开始下雪的特定时间)
基础通关(测试时间:10分钟)
一.单项选择
1.(24-25八年级下·江西赣州·期中)—Hey, Kathy. How do you like my new shoes?
—Oh, sorry. But what _________ you _________ just now? I _________ about something else.
A.did; say; though B.have; said; was thinking
C.did; say; was thinking D.have; said; thought
2.(24-25八年级下·北京海淀·期末)—What were you doing when the fire alarm went off?
—I ________ on my science project in the classroom.
A.was working B.worked C.work D.will work
3.(24-25八年级下·安徽宿州·期中)—What were you doing at the time of the rainstorm?
—When the rainstorm came, I ________ in the library.
A.read B.reads C.was reading D.am reading
4.(24-25八年级下·江西南昌·期中)—Alice, I called you up at eight yesterday morning, but you didn’t answer. What were you doing then?
—I ________ in the kitchen.
A.cook B.is cooking C.cooked D.was cooking
5.(2025·北京·中考真题)Mary ________ a picture when her dad got home yesterday evening.
A.draws B.was drawing C.is drawing D.will draw
6.(25-26八年级上·安徽六安·阶段练习)—________ you told me, I had no idea about the fact.
—Well, the earlier you know the truth, the better it will be for you.
A.Until B.If C.Whatever D.After
7.(25-26九年级上·甘肃·阶段练习)________ Helen’s knowledge and vocabulary increased, she asked more and more questions.
A.Unless B.While C.As D.Before
8.(25-26八年级上·江西南昌·阶段练习)—When will the new library open to the public?
—It won’t open ________ next Monday.
A.after B.since C.until D.when
9.(25-26八年级上·吉林长春·阶段练习) I ________ go home ________ the concert was over.
A.won’t; till B.wasn’t; till C.don’t; until D.didn’t; until
10.(25-26八年级上·全国·单元测试)I have made many new friends in our school since I ________ the Drama Club.
A.join B.joined C.joining D.will join
11.(25-26八年级上·安徽·阶段练习)—I’m so hungry. May I start having the meal now?
—I’m afraid you can’t, dear. Please wait ________ everyone is ready.
A.until B.because C.after D.when
12.Our school life a lot since 2017. We have more activities now.
A.changes B.changed C.will change D.has changed
13.My father in a panda protection center for 10 years, so he knows a lot about pandas.
A.was working B.is working C.has worked D.will work
14.—Lucy, is your uncle a teacher?
—Yes,he is. He history for nearly 20 years.
A.teaches B.has taught C.is teaching D.will teach
二.填空
1.(24-25八年级上·云南·期中)He was very happy after he (win) the basketball game.
2.(25-26八年级上·全国·课后作业)A spring is coming, the weather is becoming warmer.
3.(25-26八年级上·全国·随堂练习)I (go) to bed until eleven last night.
4.(24-25九年级上·江苏无锡·阶段练习)—Excuse me! When can I get my car back?
—Not until it (repair) next Saturday.
5.(25-26八年级上·全国·课后作业)Technology has gone so far (从我小时候起).
6.(25-26八年级上·全国·课后作业)I (call) you as soon as I (get) the test results.
重难突破(测试时间:10分钟)
(25-26八年级上·辽宁阜新·阶段练习)
Peter is an eighth-grade student. He 1 (be) to many places of interest so far. He always hoped 2 (visit) Shanghai. This year, his dream finally came true.
3 April 4th, Peter’s family took the train to Shanghai. After having a break, at the hotel, they set off for the underground station on foot. 4 (they) first destination (目的地) was Zhujiajiao Ancient Town. They took the underground because it was much 5 (fast). There were many kinds of activities in the old town. After arriving there, they 6 (taste) many kinds of delicious food first. Then they watched Kunqu Opera performances and hanfu shows.
On the 7 (two) day, Peter’s family went to Haichang Ocean Park. They not only watched many ocean animals, but also joined in some traditional activities about the festival. For example, Peter played an ancient game—touhu. It was so 8 (interest).
On the last day of the vacation, they went to four concerts. Musicians played Chinese and Western musical instruments. They also went to Jiabei Country Park. They had fun at a music festival 9 took many photos at a Chinese character art show.
“The three-day vacation was 10 unforgettable experience for me,” Peter said. “I learned a lot about Chinese traditional art and history.”
易混易错(测试时间:10分钟)
一.单项选择
1.We a party for Kate. It’s supposed to be a surprise.
A.were having B.had C.will have D.have had
2.Michael in a school in Yunnan from February to June next year.
A.teach B.taught C.will teach D.was teaching
3.Look on the bright side of life, and imagine that you a happy and successful future.
A.had B.will have C.have D.have had
二.填空
1.She looked at me and said,“Oh, thank you very much, but someone (give) me food earlier and I’m quite full now.
2.You might be surprised to hear that the number of people sleeping rough(露宿)in London has doubled in the last five years and has i by 30% across the rest of the country during the last two years.
3.She (study) English in the school since she left her hometown.
4.My mother (be)a good example for me since I was young.
5.It’s nice to see you again. We (see)each other since 2014.
链接中考(测试时间:15分钟)
(2024深圳三模改编)
My best friend Kaiya is like me.She 1.____________ (remind) me of myself.In the past, I 2.____________ (be)never confident because of my appearance.People always laughed at my weight, my height, my hairstyle, etc.At that time, I was the shortest student in my class.I started getting depressed.However, someone told me something that I will always remember.
It was in March.Surrounded by a group of girls who 3.____________ (point) at me and laughed at me, I couldn’t help crying.The tears rolled down my face like a rushing river.To my surprise, someone lifted my head up and wiped the tears from my eyes.
I then knew it was our English teacher, Miss Li.She said,“you 4.____________ (be) perfect the way you are.You should never change or hate yourself.People 5.____________ (accept)you for who you 6.____________ (be).But if you cannot accept yourself, then how will other people accept you?” I 7.____________ (inspire)by her words.Over the past few months,I 8.____________ (learn) that no one is perfect and that we all have flaws.Now I have wonderful friends who 9.____________ (love)me for who I am.
Now, seeing Kaiya cry,I decide to tell her the same thing Miss Li 10.____________ (tell)me.
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专题01 语法知识串讲1(过去进行时、现在完成时、时间状语从句)(期末复习讲义)
语法点
常考题型
命题趋势
过去进行时
现在完成时
时间状语从句
单项选择
语法选择
语法填空等
1.注重素养:更加注重对学生英语核心素养的考查。
2.情境化突出:借助生活、学校、社会等多种情境,将语法考察与实际生活相结合。
3.文化传承与价值导向明显:注重选取具有文化内涵和思想价值的语篇。
过去进行时
知识点01 谓语构成:由“助动词be的过去形式(was/were)+v-ing”。
知识点02 各种句式变化:否定形式是在be(was/were)后加not。
一般疑问句是把be(was/were)放到句首。如:
He was not waiting for me at that time.
---- Was he waiting for me at that time? ---- Yes, he was.(No he wasn’t)
知识点03 过去进行时的用法
① 表示过去某一时刻正在进行或发生的动作。
② 表示过去某一段时间内一直在做或持续进行的动作。
③ 在复合句中,若主要动作和背景动作是同时发生的,那么主从句都可用过去进行时。如:
④ 表示从过去某一时间看来将要发生的动作,尤其是come, go, leave, start, begin, move等表示位置移动和起止的动词。
⑤ 与现在进行时相似,过去进行时也通常与 always, forever, continually等副词连用,表示满意、称赞、惊讶、厌恶等感情色彩。
1.They were watching TV at ten o’clock last night. 昨晚十点他们在看电视。
2.I was cooking dinner when my husband got home yesterday afternoon. 我丈夫昨天下午到家时,我正在做晚饭。
3.What were you doing yesterday evening? 昨天晚上你一直在干些什么?
4.He was doing his homework between 8:00 and 9:00 on Sunday morning. 星期日八点到九点他一直在做作业。
5.Mary was doing some reading while her younger brother was writing. 玛丽在看书,此时,她弟弟在写字。
6.She told me she was leaving for Beijing next week. 她告诉我她下周动身去北京。
7.We two were always quarrelling. 我们俩老是吵架。
8.The boy was continually asking questions. 这孩子总是问东问西的。
知识点04 过去进行时常见的时间状语
① 过去进行时常与过去某一特定时间状语连用。常见的时间状语有:last night, at that time, at noon
② 也有时在没有时间状语的情况下,需要通过上下文的暗示或者在同一个句子中的推理来判定用过去进行时。如:yesterday, last Sunday等。
1.I was reading a book at that time. 在那时我在看书。
2.I was watching TV at 8 o’clock yesterday evening. 昨晚八点钟的时候我在看电视。
3.At that time, we all knew what we were studying for. 那时,我们都知道为什么而学习。
知识点05 when和while的区别:
① 引导时间状语从句时,while 连接的是时间段,后常接延续性动词;而when连接的既可以是延续性动词也可以是非延续性动词。
② while可以连接两个并列的句子,而when不可以。
③ when可作特殊疑问词,对时间进行提问;while 不能。
1.When were you born? 你是什么时候出生的?
2.What was your father doing while your mother was cooking?你妈妈做饭的时候,你爸爸在干什么呢?
3.What was your mother doing when you came back? 当你回来时,你妈妈在干什么呢?
4.I was trying my best to finish my work while my sister was watching TV. 我当时正在尽力完成作业,而我的妹妹正在看电视。
易|错|点|拨
过去进行时和一般过去时的用法比较
① 过去进行时往往表示动作的未完成性,而一般过去时则往往表示动作已完成。
②过去进行时侧重说明动作持续时间的长度,而一般过去时则侧重说明事实。
1.He was doing his homework in the afternoon. (没有言明作业是否完成)
2.He did his homework in the afternoon. (作业已做完)
3. It rained all night. (只说明下雨事实)
现在完成时
知识点01谓语构成
由“助动词have/has + 过去分词”构成。在人称代词后have, has可以缩写为’ve或’s, have not
缩写haven’t, has not 缩写hasn’t。
知识点02各种句式变化
否定形式是在have/has后加not。一般疑问句是把have/has放到句首。如:
He has eaten breakfast. // He hasn’t eaten breakfast. //---- Has he eaten breakfast? ---- Yes, he has. (No, he hasn’t.)
【注意】过去分词变化规则基本与过去式变化相同,有些特殊变化需单独记忆。
知识点03 现在完成时的用法
1 表示在说话之前已经完成或刚完成的动作对现在产生的影响或结果,常与already, ever, never, just, yet, before 等词连用。
② 表示动作从过去开始持续到现在,或还有可能持续下去的动作或状态。常与for和since引导的短语或从句连用。动词必须是延续性动词。
1.I have just bought a ten-speed bicycle.
2.They have already cleaned the classroom.
3.We have lived here since 1976.
4.They have waited for more than two hours.
知识点04一般过去时与现在完成时的区别
一般过去时表示过去某时发生的动作或单纯叙述过去的事情,强调动作;现在完成时为过去发生的,但强调过去的事情对现在的影响,强调的是影响;一般过去时常与具体的过去时间状语连用。现在完成时属于现在时态范围,因此不能和表示过去时间的状语连用。试比较:
I saw this film yesterday.(强调看的动作发生过了,不涉及现在)
I have seen this film. (强调对现在的影响,电影的内容已经知道了。)
知识点05
瞬间动词,如come, go, arrive, die, buy, borrow, leave, join, marry, begin, finish, end等不能与for, since状语连用。但可以改变为其他表示相同意思的延续性动词。如:
误:The old man has died for a few years.
正:The old man has been dead for a few years. // The old man has been dead since a few years ago.
The old man died a few years ago. // It is a few years since the old man died.
A few years has passed since the old man died.
瞬间动词的变化:
瞬间性动词的完成时
→
延续性动词或状态动词的完成时
have
(already)
gone to…
have
been in / at …
for (two years)
has
come to…
has
been here
since (1990)
(had)
left…
(had)
been away from…
arrived…
been in…
died
been dead
begun
been on
ended
been over
bought...
had…
borrowed…
kept…
joined…
been in …
知识点06 have/has been to, have/has gone to和have/has been in的区别:
have/has gone to意为“到某地去了”,说话时该人不在现场。一般只用第三人称作主语。have/has been to意为“曾经去过某地”,表示一种经历,含有“现在已离开那儿”之意,后可接次数(如once,twice,three times等)表示“去过某地几次”,也可和just,never,ever等连用。have been in表示“到某地多长时间了”,常与时间段连用。
1.I have never been to the Great wall. 我从未去过长城。
2.---- Where is Tom? ---- He has gone to the UK.(即现在不在这儿)
3.I have been in Australia for three years. 我到澳大利亚已有三年了。
知识点07句型:
It is / has been + (多久)+ since + 主语(人)+谓语(过去时)+……+过去时间状语
[注意] 在其它的时态中也存在类似问题,记住,关键是:瞬间动词不能和表达一段时间的状语连用。
How long may I keep the book?(这本书我能借多久?)(句子中keep取代了borrow)
时间状语从句
知识点1 0时间状语从句表示时间
常用when;while;as;before;after;since;till/until;as soon as等连词来引导。时间状语从句中的谓语动词不能用一般将来时,只能用一般现在时表示将来发生的动作或存在的状态。
知识点02由when(在……的时候;当……的时候)引导的时间状语从句,可表示“时间点”或“时间段”,从句谓语可以是终止性动词,也可以是延续性动词。when可以指主句谓语动词和从句谓语动词所表示的动作同时或先后发生。
1.When I got home, he was having supper. 当我回到家的时候,他正在吃饭。
2.When he reached home, he had a little rest. 回到家以后,他休息了一会儿。
3.When she came into my room, I was just reading a book. 她走进我房间时,我正在看书。
知识点03由while(当……的时候) 引导的时间状语从句,只可表示“时间段”,从句谓语只限于延续性动词。while强调主句谓语动词表示的动作持续于while从句所指的整个时间内;
1.Please listen to me carefully while I read. 我读的时候请认真听。
2.I can listen to the radio while I work. 我可以边听收音机边工作。
3.While I was sleeping, my father came in. 我睡觉时,我的父亲进来了。
4.Father was cleaning the car while I was playing computer games. 当我正在打电脑游戏时,爸爸在清洗汽车。
知识点04由as (当……的时候)引导的时间状语从句,表示的是一件事情正在发生,另一件事也正在进行当中。但与 while 从句不同的是,as 从句一般不用正在进行时,而只是一般过去时。as 从句一般可以翻译成“一边……一边……;与……同时”。as 表达的事件,往往只是主句动作发生的背景或条件时,as 只是一个次要的时间说明,不像while 从句有强调 while 动作本身的意思。因此,as也常翻译成“随着……”之意。as从句是终止性动词时,主句通常也必须是终止性动词。
1.The little girls sang as they went. 小姑娘们一边走,一边唱。
2.The students took notes as they listened. 学生们边听课边做笔记。
3.As we talked on, he got more and more excited. 我们继续往下谈的时候,他越来越兴奋。
4.As years go by, China is getting stronger and richer. 随着时间一年一年过去,中国变得越来越富强了。
知识点05由before(在……之前)和after(在……之后)引导的时间状语从句。注意before引导的从句不再用否定式的谓语,并且当before引导的从句位于主句之后,有时译成“就,才”。还要注意主句和从句之间的时间关系。当主句用将来时,从句总是用现在时;如果before引导的主句谓语用的是过去完成时,则从句动词多用一般过去时,这样以便体现动作发生的先后。after表示主句动作发生在从句动作之后。主句和从句的动作的时间关系正好与before引导的从句相反。
1.Einstein almost knocked me down before he saw me. 爱因斯坦几乎把我撞倒才看到我。
2.My father had left for Canada just before the letter arrived. 我父亲恰好在信到之前去加拿大了。
3.After we had finished the work, we went home. 完成工作之后,我们回家了。(从句用过去完成时,主句用一般过去时)
4.I will go out to play basketball with you after I finish my homework. 我做完功课后就和你一起出去打篮球。
知识点06由since(自从……以来)引导的时间状语从句。它的谓语动词可以是延续性的动词,又可以是瞬时动词。一般情况下,从句谓语动词用一般过去时,而主句的谓语动词用现在完成时。但在It is+时间+since从句的句型中,主句多用一般现在时。
1.I have been in Beijing since you left. 自从你离开以来,我一直在北京了。
2.We have made many dumplings since we began to cook. 自从我们开始做饭,我们已经包了许多饺子了。
3.It is four years since my sister lived in Beijing. 我妹妹不在北京住有四年了。
4.It is five months since our boss was in Beijing.我们老板离开北京有五个月了。
5.It has been/is three years since we met last time. 自从我们上次见面,已经三年了。
知识点07由until/till(直到……为止;直到……才)引导的时间状语从句。一般情况下两者可以互换,但是在强调句型中多用until。需要注意的是:如果主句中的谓语动词是瞬时动词时,必须用否定形式,表示“直到……才”的意思,主句谓语动词一般用终止性动词,这时,till和until可用before替换;如果主句中的谓语动词是延续性动词时,用肯定或否定形式都可以,但表达的意思不同,until和till在肯定句中意为“直到……为止”。till不可以用在句首,而until可以放在句首。
1.I worked until he came back. 我工作到他回来为止。
2.I didn’t work until he came back. 他回来我这才开始工作。
3.We won’t start until/till/before Bob comes. 直到鲍勃来我们才会开始。
4.He didn’t go to bed until/till he finished his homework. 他直到做完作业才睡觉。(go to bed 表示的动作不能持续)
知识点08由as soon as引导的时间状语从句。表示“一……就……”,强调动作紧密相连。
1.We began t work as soon as we got there. 我们一到那儿,就马上开始工作。
2.As soon as I reach Canada, I will ring you up. 我一到加拿大,就给你来电话。
知识点09时间状语从句的时态:
一般来说时间状语从句的主句与从句的时态前后要一致。如果时间状语从句主句谓语动词用一般将来时,从句谓语动词常用一般现在时表示将来时间。
1.I will call you as soon as I arrive there. 我一到达那儿就给你打电话。
2.Mozart started writing music when he was four years old. (当)莫扎特四岁的时候,开始写音乐作品。
知识点10when引导的宾语从句和状语从句的区别:
when引导时间状语从句时,意为“当……时候”;引导宾语从句时,意为“什么时候”。
1.He asked when we will hold the sports meeting. 他问我们什么时候开运动会。
2.When the weather is fine, many families go out for a walk. 天气好时,很多家庭都出去散步。
3.---- Do you know when he will come back tomorrow? 你知道明天他什么时候回来吗?
---- Sorry, I don’t. When he comes back, I’ll tell you. 对不起我不知道,当他回来的时候,我就告诉你。
知识点11when,while和as的区别和联系:都可表示“当……的时候”,但用法有区别:
① when引导的从句的谓语动词可以是延续性的动词,又可以是瞬时动词。并且when有时表示“就在那时”。
1.When she came in, I stopped eating. 她进来时,我在吃饭。(瞬时动词)
2.When I lived in the countryside, I used to carry some water for him. 当的住在农村时,我常常为他担水。(延续性的动词)
3.We were about to leave when he came in. 我们就要离开,就在那时他进来了。
知识点12 while引导的从句的谓语动作必须是延续性的,并强调主句和从句的动作同时发生(或者相对应)。并且while有时还可以表示对比。
1.While my wife was reading the newspaper, I was watching TV. 当我妻子在看报纸的时候,我在看电视。(was reading是延续性的动词,was reading和was watching同时发生)
2.I like playing football while you like playing basketball. 我喜欢踢足球,而你喜欢打篮球。(对比)
知识点13 as表示“一边……一边”,as引导的动作是延续性的动作,一般用于主句和从句动作同时发生;as也可以强调“一先一后”。
1.We always sing as we walk. 我们总是边走边唱。(as表示“一边……一边”)
2.As we was going out, it began to snow. 当我们出门时,开始下雪了。(as强调句中两个动作紧接着先后发生,而不强调开始下雪的特定时间)
基础通关(测试时间:10分钟)
一.单项选择
1.(24-25八年级下·江西赣州·期中)—Hey, Kathy. How do you like my new shoes?
—Oh, sorry. But what _________ you _________ just now? I _________ about something else.
A.did; say; though B.have; said; was thinking
C.did; say; was thinking D.have; said; thought
【答案】C
【详解】句意:——嘿,凯西。你觉得我的新鞋怎么样?——哦,对不起。你刚才说什么来着?我刚在正在想别的事。
考查动词时态。根据“just now”可知,该句是一般过去时,句中有实义动词,助动词填did,接动词原形say;根据“Oh, sorry.”以及“I…about something else.”可知,第三空描述过去正在进行的动作,应该说当时自己正在想别的事,因此填was thinking。故选C。
2.(24-25八年级下·北京海淀·期末)—What were you doing when the fire alarm went off?
—I ________ on my science project in the classroom.
A.was working B.worked C.work D.will work
【答案】A
【详解】句意:——火警响起的时候你在做什么?——我当时正在教室里做我的科学项目。
考查过去进行时。was working过去进行时结构;worked过去式或过去分词;work工作,动词原形;will work一般将来时结构。根据“What were you doing when the fire alarm went off?”可知,问句询问火警响起(过去某一时刻)时对方正在做什么,回答用过去进行时“was working”,强调在火警响起时自己正在“做科学项目”,故选A。
3.(24-25八年级下·安徽宿州·期中)—What were you doing at the time of the rainstorm?
—When the rainstorm came, I ________ in the library.
A.read B.reads C.was reading D.am reading
【答案】C
【详解】句意:——暴风雨发生的时候你在做什么?——暴风雨来的时候,我正在图书馆看书。
考查过去进行时。read动词原形或过去式;reads第三人称单数形式;was reading过去进行时;am reading现在进行时。根据问句中“at the time of the rainstorm”以及答句中“When the rainstorm came”可知,这里问的是过去暴风雨来的那个时刻正在做什么,要用过去进行时来回答。故选C。
4.(24-25八年级下·江西南昌·期中)—Alice, I called you up at eight yesterday morning, but you didn’t answer. What were you doing then?
—I ________ in the kitchen.
A.cook B.is cooking C.cooked D.was cooking
【答案】D
【详解】句意:——爱丽丝,我昨天早上八点给你打电话,但你没接。那时你在做什么?——我当时正在厨房做饭。
考查过去进行时。cook做饭,动词原形;is cooking现在进行时结构;cooked过去式;was cooking过去进行时结构。根据问句中“at eight yesterday morning”以及“What were you doing then?”可知,这里询问昨天早上八点那个时刻正在做什么,回答应用过去进行时,其结构是“was/were+现在分词”,主语是I,be动词用was,cook的现在分词是cooking,所以用“was cooking”。故选D。
5.(2025·北京·中考真题)Mary ________ a picture when her dad got home yesterday evening.
A.draws B.was drawing C.is drawing D.will draw
【答案】B
【详解】句意:昨天晚上,当她的爸爸回家时,玛丽正在画画。
考查动词时态。本句是含when引导的时间状语从句的复合句,从句动作发生时,主句动作正在进行,从句是一般过去时,主句应为过去进行时,结构是was/were doing,主语是第三人称单数,be动词用was。故选B。
6.(25-26八年级上·安徽六安·阶段练习)—________ you told me, I had no idea about the fact.
—Well, the earlier you know the truth, the better it will be for you.
A.Until B.If C.Whatever D.After
【答案】A
【详解】句意:——直到你告诉我,我才知道这个事实。——嗯,你越早知道真相,对你来说就越好。
考查连词辨析。Until直到;If如果;Whatever无论什么;After在……之后。根据“you told me, I had no idea about the fact.”可知,是指直到你告诉我,我才知道事实。故选A。
7.(25-26九年级上·甘肃·阶段练习)________ Helen’s knowledge and vocabulary increased, she asked more and more questions.
A.Unless B.While C.As D.Before
【答案】C
【详解】句意:随着海伦的知识和词汇量增长,她问的问题越来越多。
考查连词辨析。Unless除非;While当……时(强调同时性);As随着(表伴随或渐进);Before在……之前。根据“Helen’s knowledge and vocabulary increased, she asked more and more questions.”可知,前后分句为伴随关系,强调知识增长与提问增加的同步性,故选C。
8.(25-26八年级上·江西南昌·阶段练习)—When will the new library open to the public?
—It won’t open ________ next Monday.
A.after B.since C.until D.when
【答案】C
【详解】句意:——新图书馆什么时候对公众开放?——直到下周一才会开放。
考查not until用法。after在……之后;since自从;until直到;when当……时候。not ... until ...“直到……才……”是固定搭配。故选C。
9.(25-26八年级上·吉林长春·阶段练习) I ________ go home ________ the concert was over.
A.won’t; till B.wasn’t; till C.don’t; until D.didn’t; until
【答案】D
【详解】句意:直到音乐会结束我才回家。
考查not ... until ...结构。not ... until ...“直到……才……”。根据“the concert was over”可知,句子用一般过去时,go是实义动词,否定形式要借助助动词didn’t。故选D。
10.(25-26八年级上·全国·单元测试)I have made many new friends in our school since I ________ the Drama Club.
A.join B.joined C.joining D.will join
【答案】B
【详解】句意:自从我加入戏剧社以来,我在学校交了很多新朋友。
考查since引导的时间状语从句。“since”引导的时间状语从句,主句用现在完成时,从句用一般过去时。join的过去式是joined。故选B。
11.(25-26八年级上·安徽·阶段练习)—I’m so hungry. May I start having the meal now?
—I’m afraid you can’t, dear. Please wait ________ everyone is ready.
A.until B.because C.after D.when
【答案】A
【详解】句意:——我饿极了。我现在可以开始吃饭了吗?——恐怕不行,亲爱的。请等到大家都准备好了。
考查连词。until直到;because因为;after在……之后;when当……时。根据“I’m afraid you can’t, dear.”可知,答语表示不建议现在开始吃饭,故此处指要等到所有人都准备好再开始吃饭,until符合。故选A。
12.Our school life a lot since 2017. We have more activities now.
A.changes B.changed C.will change D.has changed
答案 D 句意:我们的校园生活从2017年开始变化很大。我们现在有更多的活动。此题考查现在完成时的用法。根据时间状语since 2017可知应用现在完成时,因此选D。
13.My father in a panda protection center for 10 years, so he knows a lot about pandas.
A.was working B.is working C.has worked D.will work
答案 C 句意:我爸爸在一个熊猫保护中心工作10年了,因此他对熊猫很了解。本题考查动词的时态。根据前一分句中的时间状语for 10 years及句意可知应该用现在完成时态,故选C。
14.—Lucy, is your uncle a teacher?
—Yes,he is. He history for nearly 20 years.
A.teaches B.has taught C.is teaching D.will teach
答案 B 句意:——Lucy,你的叔叔是一位老师吗?——是的,他是(一位老师)。他教历史已经有将近二十年了。此题考查现在完成时态的用法。现在完成时态的具体意义:动作从过去的某一时刻开始延续到现在,并且对现在产生了影响。Lucy的叔叔成为一位老师从将近20年前就开始了,而且延续到现在。故选B。
二.填空
1.(24-25八年级上·云南·期中)He was very happy after he (win) the basketball game.
【答案】won
【详解】句意:他赢得篮球比赛后非常高兴。根据“He was very happy after he...”可知,此处after引导的时间状语从句,主句用一般过去时,从句也用一般过去时,win的过去式是“won”。故填won。
2.(25-26八年级上·全国·课后作业)A spring is coming, the weather is becoming warmer.
【答案】(A)s
【详解】句意:随着春天来临,天气正变得更暖和。根据“spring is coming”以及首字母提示,此处是说随着春天的到来,as“随着”。故填(A)s。
3.(25-26八年级上·全国·随堂练习)I (go) to bed until eleven last night.
【答案】didn’t go
【详解】句意:昨晚我直到十一点才上床睡觉。根据“until eleven last night”可知,此处指直到十一点才睡觉,“not...until...”是固定搭配,意为“直到……才……”,句子时态为一般过去时,句中含有实义动词go,所以要借助助动词didn’t,后面的动词用原形。故填didn’t go。
4.(24-25九年级上·江苏无锡·阶段练习)—Excuse me! When can I get my car back?
—Not until it (repair) next Saturday.
【答案】is repaired
【详解】句意:——打扰一下!我什么时候能取回我的车? ——要到下周六才修好。repair“维修”,动词,且主语it指代的是car“汽车”,与谓语动词repair“维修”之间为被动关系,应用被动语态。答句中省略了主句,从句为含有“not until”引导的时间状语从句,应遵循“主将从现”原则,则应用一般现在时的被动语态,其结构为“am/is/are done”,主语it为第三人称单数形式,be动词应用is,repair的过去分词形式为repaired。故填is repaired。
5.(25-26八年级上·全国·课后作业)Technology has gone so far (从我小时候起).
【答案】since I was young
【详解】句意:从我小时候起,技术发展至今。句子是由since“自从”引导的时间状语从句,从句主语为I“我”,时态为一般过去时,be动词用was,形容词young“幼小的”作表语。故填since I was young。
6.(25-26八年级上·全国·课后作业)I (call) you as soon as I (get) the test results.
【答案】 will call get
【详解】句意:我一拿到考试结果就给你打电话。“as soon as”引导时间状语从句,遵循“主将从现”原则,主句用一般将来时,从句用一般现在时。“call”的一般将来时形式是“will call”,“get”用原形。故填will call;get。
重难突破(测试时间:10分钟)
(25-26八年级上·辽宁阜新·阶段练习)
Peter is an eighth-grade student. He 1 (be) to many places of interest so far. He always hoped 2 (visit) Shanghai. This year, his dream finally came true.
3 April 4th, Peter’s family took the train to Shanghai. After having a break, at the hotel, they set off for the underground station on foot. 4 (they) first destination (目的地) was Zhujiajiao Ancient Town. They took the underground because it was much 5 (fast). There were many kinds of activities in the old town. After arriving there, they 6 (taste) many kinds of delicious food first. Then they watched Kunqu Opera performances and hanfu shows.
On the 7 (two) day, Peter’s family went to Haichang Ocean Park. They not only watched many ocean animals, but also joined in some traditional activities about the festival. For example, Peter played an ancient game—touhu. It was so 8 (interest).
On the last day of the vacation, they went to four concerts. Musicians played Chinese and Western musical instruments. They also went to Jiabei Country Park. They had fun at a music festival 9 took many photos at a Chinese character art show.
“The three-day vacation was 10 unforgettable experience for me,” Peter said. “I learned a lot about Chinese traditional art and history.”
【答案】1.has been 2.to visit 3.On 4.Their 5.faster 6.tasted 7.second 8.interesting 9.and 10.an
【导语】本文作者讲述了Peter一家去上海游玩的经历。
1.句意:到目前为止,他已经去过许多名胜古迹。根据“so far”可知,句子时态为现在完成时,其结构为“have/has done”,主语为He,助动词用has,be的过去分词为been。故填has been。
2.句意:他一直希望去参观上海。hope to do sth.“希望做某事”,固定短语,所以此处填动词不定式。故填to visit。
3.句意:在4月4日,Peter一家坐火车去了上海。表示在具体的某一天,用介词on,放句首首字母大写。故填On。
4.句意:他们的第一个目的地是朱家角古镇。此处修饰名词“first destination”,用形容词性物主代词their“他们的”,句首首字母大写。故填Their。
5.句意:他们乘坐地铁,因为它更快。much修饰比较级,fast的比较级为faster“更快的”。故填faster。
6.句意:到达那里之后,他们首先品尝了许多种类的美食。本文描述过去的事情,句子时态为一般过去时,谓语动词用过去式,taste的过去式为tasted“品尝”。故填tasted。
7.句意:在第二天,Peter一家去了海昌海洋公园。此处表示“第二天”,用序数词second“第二”。故填second。
8.句意:它是如此有趣。分析句子结构可知,此处作be动词的表语,用形容词形式,修饰物,用interesting“有趣的”。故填interesting。
9.句意:他们在音乐节上玩得很开心,并且在汉字艺术展上拍了许多照片。分析句子结构可知,此处表示并列关系,用连词and“和”。故填and。
10.句意:对于我来说,三天的假期是一次难忘的经历。此处表示泛指,unforgettable以元音音素开头,用不定冠词an。故填an。
易混易错(测试时间:10分钟)
一.单项选择
1.We a party for Kate. It’s supposed to be a surprise.
A.were having B.had C.will have D.have had
答案 C 句意:我们将为凯特举办一个聚会。它应该是个惊喜。本题考查动词时态。A项为过去进行时;B项为一般过去时;C项为一般将来时;D项为现在完成时。根据后句Its supposed to be a surprise.可知聚会还没举办,故用一般将来时态。be supposed to应该,被期望,理应。
2.Michael in a school in Yunnan from February to June next year.
A.teach B.taught C.will teach D.was teaching
答案 C 句意:Michael将从明年二月到六月在云南一所学校教书。本题考查动词的一般将来时态。根据next year可知此句时态为一般将来时,故选C。
3.Look on the bright side of life, and imagine that you a happy and successful future.
A.had B.will have C.have D.have had
答案 B 句意:往好的方面想,想象你会拥有一个幸福成功的未来。本题考查一般将来时的用法。由imagine和future可知,本题答案为B。
二.填空
1.She looked at me and said,“Oh, thank you very much, but someone (give) me food earlier and I’m quite full now.
答案 has given 根据后面一句提到“我现在很饱了”可知,已经有人给过她食物了,所以用现在完成时,故填has given。
2.You might be surprised to hear that the number of people sleeping rough(露宿)in London has doubled in the last five years and has i by 30% across the rest of the country during the last two years.
答案 increased 句意:听到这些你可能会吃惊。在过去的五年中,伦敦露宿街头的人的数量已经翻倍,而近两年,英国其他地方的数量增长了30%。根据句意及首字母可知填increased。注意要用过去分词和has构成现在完成时。
3.She (study) English in the school since she left her hometown.
答案 has studied 句意:她自从离开家乡就在这所学校学习英语。时态为现在完成时。
4.My mother (be)a good example for me since I was young.
答案 has been 句意:我妈妈从我小的时候就给我树立了好的榜样。本题考查动词时态。由题干中的since I was young可知主句应用现在完成时,结构为have/has done。
5.It’s nice to see you again. We (see)each other since 2014.
答案 haven’t seen 句意:再次见到你很高兴。自从2014年我们就没见到过。本题考查时态。通过时间状语since 2014可知,应该是现在完成时。
链接中考(测试时间:15分钟)
(2024深圳三模改编)
My best friend Kaiya is like me.She 1.____________ (remind) me of myself.In the past, I 2.____________ (be)never confident because of my appearance.People always laughed at my weight, my height, my hairstyle, etc.At that time, I was the shortest student in my class.I started getting depressed.However, someone told me something that I will always remember.
It was in March.Surrounded by a group of girls who 3.____________ (point) at me and laughed at me, I couldn’t help crying.The tears rolled down my face like a rushing river.To my surprise, someone lifted my head up and wiped the tears from my eyes.
I then knew it was our English teacher, Miss Li.She said,“you 4.____________ (be) perfect the way you are.You should never change or hate yourself.People 5.____________ (accept)you for who you 6.____________ (be).But if you cannot accept yourself, then how will other people accept you?” I 7.____________ (inspire)by her words.Over the past few months,I 8.____________ (learn) that no one is perfect and that we all have flaws.Now I have wonderful friends who 9.____________ (love)me for who I am.
Now, seeing Kaiya cry,I decide to tell her the same thing Miss Li 10.____________ (tell)me.
【语篇解读】 英语老师的鼓励让我充满自信。我决定把她的方法用来帮助我的好友。
【答案】
1.reminds 根据第一句的时态可推知,本空应该用一般现在时,又因为主语为She,故答案为reminds。
2.was 根据语境中的In the past可知,设空处用一般过去时,故答案为was。
3.pointed 根据后面的laughed可知,设空处为pointed。
4.are 本句为直接引语,故用一般现在时。
5.will accept 结合下文的then how will other people accept you可知,答案为will accept。
6.are 由上下文语境可知,应填are。
7.was inspired 设空处表示过去的事情且主语与inspire为被动关系,故用一般过去时的被动语态。
8.have learned (learnt) 根据前面的Over the past few months可知,设空处用现在完成时。
9.love “who 9.________(love)me for who I am”为定语从句,先行词为 friends 且设空处说的是现在的情况,应用一般现在时,故答案为love。
10.told “Miss Li 10.________ (tell)me”为定语从句,设空处表示过去的事情,故用一般过去时。
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