2013届高考英语一轮复习课件：必修1 Unit 3《Travel journal》（新人教版福建专用）

2013届高考英语一轮复习课件,新人教版福建专用,Unit 3 Travel journal,(1)I prefer the view taken by Mike. (2)She preferred to live among the working people. (3)He preferred spending the summer by himself. (4)She preferred him to spend all day out. (5)She preferred that he should do it in the kitchen., prefer vt.,根据语境感悟用法, prefer vt.,(1)跟名词或代词 (2)跟不定式 (3)跟动名词 (4)跟带不定式的复合结构 (5)跟that从句,短语 prefer to dorather than do 宁愿(愿意)而不愿 prefer sth./doingto sth./doing 喜欢而不喜欢(胜过)(to是介词), prefer vt.,链接 preference n. 偏好；更加喜欢, prefer vt.,单项填空,(1) _ Sunday, rather than _ at home, I preferred _. A. It being; stay; to travel B. Being; to stay; to travel C. Having been; stay; travel D. It was; to stay; traveling,A, prefer vt.,单项填空,解析 句意：因为是星期天，我宁愿去旅游也不愿待在家里。 prefer to dorather than do 宁愿(愿意)而不愿。, prefer vt.,单项填空,(2) He prefers _ indoors _ out this afternoon. A. to stay; to go B. staying; to going C. staying; to go D. to stay; to going,解析 句意：今天下午他宁愿待在家里也不愿出去。 prefer sth./doingto sth./doing 喜欢而不喜欢(胜过)(to是介词)。,B, ever since 从那时候起，自以来,ever since 通常与现在完成时连用。可以单独使用，也可以后接从句或省略句。 He has been staying on the farm ever since. 之后他就一直住在农场里。 Ever since getting to know you, I cant stop thinking about you. 自从我认识了你，我无时无刻不想你。 I havent seen you ever since I left the small mountain village. 自从离开了小山村，我就再也没看见你。,句型 (1)Its / has been 时间段 since sb. did sth. 自从 (2)It was / had been 时间段 since sb. had done sth. 自从 注意：表达(1)中since从句中如果动词是延续性动词的一般过去时，则时间从该动作结束算起，如果是延续性动词的现在完成时或短暂性动词的一般过去时，按字面翻译即可。, ever since 从那时候起，自以来,你真正理解这句话的意思了吗？ I have never stepped onto the platform again since I was a teacher., ever since 从那时候起，自以来, persuade vt.,根据语境猜词义 (1)While shopping, people sometimes cant help being persuaded into buying something they dont really need. (2) We finally persuaded Ben of the wisdom of this decision. (3) I tried to persuade him out of smoking, but he wouldnt listen.,根据语义找匹配 A.说服 B.劝说 C.使某人信服,答案 (1) A (2) C (3) B, persuade vt.,链接 persuade sb. to do sth. persuade sb. into doing sth. 说服某人做某事 persuade sb. not to do sth. persuade sb. out of (doing) sth. 劝阻某人做某事 persuade sb. of sth. 使某人相信某事 persuade thatclause 使某人相信, persuade vt., persuade vt.,辨析 convince/persuade/advise/caution/warn convince是通过摆事实、讲道理使人相信某个事实。convince可接含of短语或that从句的双宾语，还可用在convince sb. to do或be convinced of结构中。 What she said convinced me that I was mistaken. persuade表示用劝说的方法，使人愿意采纳某种意见或采取某一个行动，强调“已经说服”；其后可接含不定式或that从句的复合宾语，也可用在persuade sb. of sth. 结构中。, persuade vt.,辨析 convince/persuade/advise/caution/warn,advise表示“劝告”的动作，不看结果，advise可接动词的ing形式作宾语，也可接that引导的宾语从句(必须用虚拟语气，即should动词原形)，而persuade不能。 My friends advised him to see a doctor, but he refused all of them. Who can persuade him?, persuade vt.,辨析 convince/persuade/advise/caution/warn,caution主要指针对有潜在危险而提出的警告，含小心从事的意思。 I must caution you against the danger. warn含义与caution相同，但语气较重，尤指严重后果。 I warned them that there might be snakes in the woods., persuade vt.,用persuade相关的句型填空 The other day, my husband (1)_ buy a coat as he thought it was too long. However, the assistant tried hard to (2)_ me (3)_ the good quality and fashionable style of it. Therefore, I couldnt help(4)_buying it. So you can see how easy it is (5)_ a woman (6)_ things that arent suitable for her.,persuaded me not to (2) persuaded (3) of (4) being persuaded into (5) to persuade (6) to buy/into buying,答案, persuade vt.,用persuade相关的句型填空, insist v.,A,B,链接 insist on/upon sth. 坚持某事物 insist on doing sth. 坚决做某事, insist v.,句型 if you insist 如果你一定要这样 insist that从句： 表“坚决要求”，从句谓语用虚拟语气 表“坚持说；坚持认为”，从句谓语用陈述语气, insist v.,辨析 insist on/ stick to insist on表示对“要求、意见、看法等”的“坚持”，后面可接动名词或动名词的复合结构； stick to表示对“真理、岗位、计划、理论、愿望、原则、决定、诺言或某种理论”的客观上的“坚持”。,单项填空 (1)The doctor insisted that I _ a high fever and that I _ a rest for a few days. A. had; had B. have; have C. had; have D. have; had,解析 insist 后的第一个that从句中的insist是“坚持认为”的意思，第二个that从句中的insist是“坚持要求”的意思，故用虚拟语气。,C, insist v.,(2)No matter what you say, I shall_ my opinion. A. carry out B. keep up C. insist on D. stick to,解析 考查动词短语辨析。carry out执行，实施；keep up保持；insist on坚决主张； stick to坚持。 按照语境此处坚持的是观点，所以选C。,C, insist v.,单项填空,在你所学范围内，哪些动词后接宾语从句，要 使用虚拟语气，其形式是“(should) do sth.”？, insist v., care about,根据语境猜词义 (1) He doesnt care about anything we may say, which makes us very angry. (2) I dont care about going fishing. (3) We should care about other peoples difficulties.,根据语义找匹配 A. 关心 B. 感兴趣 C. 不在乎；不计较,C,B,A,短语 care about sth. 关心(忧虑、惦念)某事 care about sb. 关心某人，关怀某人(多用于否定句或疑问句中) care for 喜欢；照顾；愿意；关心 take care that/to do sth. 当心，注意某事 take care of 处理，对付；照顾，照看 be careful of/to do/that 当心，注意 I dont care (that) 我不介意(在乎), care about, care about,用适当的介词填空 (1)She thinks only of herself; she doesnt care_ others. (2)She cares more _ her new clothes than anything else. (3)I dont care_ if it doesnt rain. (4)Who can care _ me when I am old?,about,for,about,for, determine v.,根据语境感悟用法 (1)Can you now determine the date for our party? (2)He determined to make his arrangements at once. (3)He determined that he would go at once. (4)He has determined on going tomorrow. (5)What determined you to accept the offer? (6)I was determined not to follow his advice. (7)I left him, determined never to set foot in his house again., determine v.,(1)determine 后可接名词，“确定，规定”。 (2)determine 后可接不定式，“决心做”。 (3)determine 后可接从句，“决心，决定”。(4)determine on doing sth. “决定，决心做某事”。(5)determine sb. to do 使某人决心/决定做。 (6)形容词作表语跟不定式或从句，“决心做”。 (7)determined 形容词作状语。, determine v.,你知道determine to do sth.与be determined to do sth.有何区别吗？,答案 determine to do sth. 是非延续性动词，强调一时的动作，意为“决定做某事”。 be determined to do sth. 形容词，说明状态，表示“坚定不移”的决心，意为“决心做某事”。,链接 determination n. 决心 determined adj. 坚决的；有决心的, determine v., determine v.,单项填空 (1)He _ to live in the countryside for a long time. A. was determined B. was determining C. determined D. had determined,解析 be determined to do sth. 意为“决心做某事”。had determined 时态不对。,A, determine v.,单项填空,解析 determined 是形容词，意为“坚定的”。,(2)She is a _ woman. A. determined B. determining C. determine D. strongminded,A, change ones mind,根据语境猜词义 (1)Maybe youll change your mind after thinking it over. (2)I just couldnt make up my mind, so in the end I bought both. (3)Im sorry but my minds made up Im leaving.,根据语义找匹配 A拿定主意，作出决定 B下定决心，决意 C改变主意, change ones mind,短语 be in two minds about 拿不定主意；犹豫不决 be the last thing on sb.s mind 是某人最不能考虑的事情 come to mind 突然想到 cross / enter ones mind 掠过脑海 take ones mind to 把心思转向 take ones mind off sth. 不再想某事, change ones mind,短语, change ones mind,have a lot on ones mind 忧心忡忡 be out of ones mind 发狂；犯傻 lose ones mind 失去理智 ones mind goes blank 脑子里突然一片空白，突然什么也想不起来 Out of sight, out of mind. 眼不见，心不烦。,短语, change ones mind,put sth. out of ones mind 把某事置于脑后 bring sth. to mind 回想起某事 keep/bear sth. in mind 记住某事 stick to ones mind 对某事经久不忘 speak ones mind 直言不讳 have an open mind about 对某事思想开放；能接受新事物,短语, change ones mind,have a close mind about 守旧；不开发 ones mind is not on sth. 不把心思用在某事上面 have a mind of your own 有主见 keep ones mind on /upon 专心于 ones mind wanders 心不在焉；走神 Great minds think alike. 英雄所见略同。 Mind your own business. 别管闲事。,翻译句子 (1) 我决心当医生。 _ (2) 任何事情都不能使我改变主意。 _,Nothing will make me change my mind.,Ive made up my mind to be a doctor., change ones mind,根据语境猜词义 (1)They argued back and forth until finally Buzz gave in. (2)They werent a particularly good team, but they refused to give in and accept defeat. (3)You were supposed to give this work in four days ago., give in, give in,根据语义找匹配 A呈交；交上 B屈服；投降 C让步,答案 (1)C (2)B (3)A,短语 give away 赠送，给予； 泄漏 give back 归还；恢复(健康) give off 放出；散发出(气体、气味、热、光) give out 分发； 用完，消耗；出毛病；发出(光、热等) give up 放弃, give in,用give in/give away/give back/give out/give up填空 (1)He picked up the pen and _ it _ to him. (2)He doesnt only _ money; he spends his whole life in looking after the poor.,give away, give in,(3)Toms legs _ and he couldnt go any farther. (4)Mother kept inviting Mrs. Smith to stay for dinner, but she finally _. (5)All girls swam across the lake except two who _ halfway.,gave out,gave in,gave up, give in,用give in/give away/give back/give out/give up填空, view,根据语境猜词义 (1)Ill sit here and look at the view of the hills. (2)There was a wide view from the top of the hill. (3)I should like to hear others view. (4)Have you viewed the museums new coin collection? (5)We can view the problem in many ways., view,根据语义找匹配 A. 看法；观点(可数)n. B. 风景；景色(可数)n. C. 目光；视野；瞥(看)见(不可数，可加不定冠词) n D.看待；持某种看法 v E. 查看；观看；看(电视节目等)v.,答案 (1)B (2)C (3)A (4)E (5)D, view,短语 in ones view 据某人看来 point of view 观点；看法 come into view 进入视野, view,辨析 view/scenery/scene/sight view 作“景色”解时是普通用语，指目中所望见的景色。 Do you enjoy the views of the West Lake? scenery 是一个不可数名词，包含不管是否映入眼帘的“风景；景色”，也包括一个地方乃至国家的整个外景或外貌。 She enjoyed mountain scenery very much., view,辨析 view/scenery/scene/sight scene 表示“景色”时可与“view”通用，但包括了其中的人及其活动。view和scene 所表达的景色都是scenery的一部分，往往指自然景色。scene还指舞台景色。 sight指“景色”且作可数名词时，往往指眼见的景色，如供人游览的景点和名胜，尤指人工制成的景色。,We can hardly wait to see them! (P22) 我们迫不及待要见他们了！,can not / hardly wait to do sth. 迫不及待地做某事 The children woke up early in the morning and couldnt wait to open the presents in the stockings. 孩子们一大早就醒来，迫不及待地打开放在袜子里的礼物。,短语 wait to do sth. 等待着做某事 wait for sb. to do sth. 等待某人做某事 wait on sb. 服侍某人 wait on sb. hand and foot 无微不至地伺候某人 wait ones turn 等到轮到某人做某事,指出下列句子中画线代词的名称 1. Mr.Bean is humorous. He is popular all over the world. 憨豆先生很幽默，他在全世界受欢迎。 2. Lets get down to our business. 让我们言归正传吧。 3. Sorry that Im not quite myself today. 对不起，今天我有点不舒服。,指出下列句子中画线代词的名称 4. Write down all the numbers of the private cars and this is what you should do. 记下所有私家车的号码，这就是你要做的事。 5. Everything is better than none. 有比没有要好。 6. All of us should help each other. 我们应该互相帮助。,指出下列句子中画线代词的名称 7. Which of the two lines appears longer? 这两条线段哪条看起来长些？ 8. All that ends well is well. 结局好才算好。 9. China is not what she was. 中国今非昔比了。,指出下列句子中画线代词的名称,答案 1. 人称代词 2.物主代词 3.反身代词 4.指示代词 5.不定代词 6.相互代词 7.疑问代词 8.关系代词 9.连接代词,1,代词是代替名词(人或事物)的词。代词分为9类：人称代词、物主代词、反身代词、指示代词、不定代词、相互代词、疑问代词、关系代词(用于定语从句)、连接代词(用于名词性从句或状语从句)。,按提示要求完成下列表格,2,人称代词有主格，宾格，所有格及反身代词。,把下列代词归入正确的类别 this, that, each other, who, what,答案 1指示代词：this; that 2相互代词：each other 3疑问代词： who; what,3,1指示代词：this, that, these, those 2相互代词：each other, one another 3疑问代词： who, which, whom, whose, what 注意：关系代词和连接代词在后面有专门讲解，故暂不考虑其类型。,完成表格，注意不定代词的基本含义和数量意义,4,1不定代词的概念：不指明代替任何特定名词或形容词的代词。能单独使用。 2不定代词的用法：不定代词在名中可作主语、定语，作定语时可修饰可数名词和不可数名词。 3不定代词有一定的数量意义。,4,以all为例，其可以单独使用时作代词，作主语如All is over.作定语时修饰名词，如All lies dont hold water.单独使用或修饰可数名词时，表达三个以上的概念，如All are here.或 All the students are here.中“所有学生”的人数应该为三个或三个以上。all修饰不可数名词，表示全部，所有的事物，如All the water is polluted.意为“所有的水已被污染。”,翻译下列句子，体会连写和分写的不定代词的含义 1. Everyone was born equal. 2. Every one of the students in our class has good sense of environmental protection. 3. They ate every one of the mooncakes.,人人生而平等。,我们班每个学生都有良好的环保意识。,他们把月饼都吃光了。,5,every, any, some, no均可与one构成不定代词，连写与分写用法上有很大区别，以every和one连用为例，连写的everyone只能表人，不带of结构；分写的every one 常带of结构，既可以表人，也可以表物。这是连写和分写的不定代词用法上的基本区别。,5,但切记no one 及none两词的用法刚好与此规律相反。即分写的no one只能表人，不带of结构；连写的none 常带of结构，既可以表人，也可以表物。简单回答中，none用以回答how many/how much提出的问题，no one 则回答who提出的问题。,用some或any填空 1. The old Frenchman has _Chinese paintings collected by his cousin. 2. _question is welcome! 3. _ parents expect too much from their children while others have no confidence in what is done by their kids.,答案 1. some 2.Any 3. Some,4. For _ reason, I have to say goodbye to all of my lovely colleagues. 5. The package couldnt be mine, for I dont have _ relatives here. 6. Id like you to lend me _ money. Do you have_？,答案 4. some 5. any 6. some; some,7. Do you feel _better today? Thank you. I feel much better now. 8. I dont know his exact age. He is _ 30 years old, I think.,答案 7. any 8. some,6,some常用于肯定句， 接复数可数名词或不可数名词，表“一些”；接可数名词单数表“某个”，接数词表“大约”；用于疑问句表“请求或期待对方肯定的回答”。any可与单、复数可数名词及不可数名词连用，多用于疑问、否定或条件句，用于肯定句时表“任何(一个)”。,用one, it或that填空 1. A desk made of wood lasts longer than _ made of plastics. 2. This news is less exciting than _. 3. There is only one dictionary left in the bookstore. Please go to buy_.,one,that,it,7,1. one, it，that三者均为代词； 2. one只能代可数名词单数，表示泛指，其复数形式为ones； 3. that既可以代可数名词又可以代不可数名词，强调与this的对应性。代可数名词时，其复数形式为those; 4. it有明显的特指性，确定性，指代上文提到的具体事物， 既可以代可数名词又可以代不可数名词，代可数名词时，其复数形式为they/them。,选用上述不定代词填空，体会其含义 1. Look! _ of his hands is covered with muddy.What a naughty boy! 2. Look! _ of his hands are covered with muddy.What a naughty boy! 3. _ student in our school wears school uniform.,Each/Either,Both,Every/Each,4. _ of his parents is from Hawaii. They _ come from San Francisco. 5. _ of the answers are not right. Some of them are apparently wrong. 6. _ his ears dont need hearing aid. His right ear is in good order.,both,All,Neither,Both,8. Would you like coffee or tea? _will do.,Either,7. _ employee isnt well paid and only those having much experience are.,Every/Each,8,1every和each均可充当形容词，接单数可数名词，意为“每个”，但前者强调个体，可以充当代词，而且可用于两个的“每个”；后者强调整体，用于两个以上的“每个”，不可以充当代词。Each/Everynot和Not every/each均表部分否定，意为“并非每个都”。,8,2. 既可以充当代词又可以充当形容词，意为“两个中的任意一个”，用法为either单数名词或eitherof the复数名词。,8,3. both意为“两个都”，接并列主语，用于both A and B结构，或接可数名词复数或用于Both of the 可数名词复数。BothnotNot both为部分否定，意为“并非两个都”。其完全否定为Neither of the意为“ 两个都不”。,8,4. all意为“三个(含)以上都”，接并列主语，接可数名词复数或用于all of the 可数名词复数结构。接可数名词单数或不可数名词时，意为“整个/所有的都”。如：All the books/All of the books published in this press are uncopyrightable.这个出版社出版的所有书籍均无合法版权。,8,All the city is surrounded by water. 整个城市四面环水。 All the rubbish should be thrown away where further pollution wont be caused.所有垃圾应该投放到不会产生二次污染的地方。 AllnotNot all为部分否定，意为“并非全都”。其完全否定为None of the意为“所有的都不”。,选用上述不定代词填空，体会其含义 1. Some people think playing computer games benefits children a lot while _hold the opposite view. 2. Can I help you? This radio doesnt work. Please show me _.,others,another,3. I am just familiar with one of the two visitors to our school._ is strange to me. 4. Helping _ people in danger is a good virtue. 5. Have you finished delivering the 108 letters of invitation? Not yet. I have just delivered 60 of them and I am to deliver_ this afternoon.,other,The other,the others,9,1. Some； others意为“一些另一些”，为固定句型，其中的“另一些(others)”为不确定对象。 2. another即可以单独作代词使用，也可接可数名词单数，表示“多者中的另一个”，也是不确定对象； 3. the other单独使用，也可接单数可数名词，只能指两者中的另一个，为确定对象；,9,4. other 只能作形容词，不可单独使用，后须接可数名词复数，相当于others； 5. the others单独使用或接可数名词复数，表一定范围中排除若干对象后剩下的其他人或物，为确定对象。,翻译下列句子 1. The frog is not a warmblooded animal. It is a coldblooded one. 2. Someone is ringing the doorbell. Go and see who it is. 3. Whats this? Its a book. 4. Who is knocking at the door? Its me.,答案 1青蛙不是温血动物，它是冷血动物。 2有人在按门铃。去看看是谁。 3这是什么？这是一本书。 4谁在敲门？ 是我。,翻译下列句子,翻译下列句子,5. What a long way it is from Beijing to London! 6. It is late autumn now. 7. It is rather cold today, isnt it? 8. Whats the cost of the dictionary? It is sixtythree yuan. 9. Its best to plant trees in spring because its warmer.,翻译下列句子,答案 5从北京到伦敦真远。 6现在是深秋。 7今天很冷，是不是？ 8那本词典多少钱？ 63元。 9春天是植树的最佳时节，因为天气更暖和。,翻译下列句子,10. It is dangerous walking on thin ice. 11. It is a fact that English is being accepted as an international language. 12. I dont think it possible to master a foreign language without much memory work. 13. Do you consider it necessary sending more people over?,翻译下列句子,答案 10在薄冰上行走是危险的。 11事实上，英语是公认的国际语言。 12我认为不进行大量的记忆学好英语是不可能的。 13你觉得再派一些人去有必要吗？,翻译下列句子,14. They found it strange that no one would take the money. 15. It was I who met him in the park last week. 16. When was it that you got to know her? 17. It is white that they painted the house. 18. It is a chief engineer that he becomes now.,翻译下列句子,答案 14他们感到奇怪，谁也不要这笔钱。 15是我上星期在公园遇到他的。 16你是在什么时候认识她的？ 17他们把房子漆成的是白色。 18他现在担任的是总工程师。,在英语中，it的使用相当广泛，它既可用作代词，如人称代词、指示代词及非人称代词， 也可用作引导词和强调结构中的强调词，其具体用法如下：,1,1,一、it作代词 1用作人称代词(personal it) 代替前文提到过的事物或不明身份的人，it作真实主语或宾语。 2用作指示代词(demonstrative it) 相当于this或that，it有时不特指某件东西，而代表前面已提到的或将会发生的某件事情。,1,3用作非人称代词(impersonal it) 代词it可用来指除人以外的一切生物和事物，无阴阳性别之分。可指时间、距离、度量、价值、自然现象(天气、气体、阴暗等)。,一、it作代词,1,二、it作引导词 1作形式主语(formal subject) 当主语是动词不定式短语、动词的ing形式短语和主语从句时，为了避免头重脚轻，往往把主语放在谓语动词之后，习惯上用it作形式主语来指代后面的真实主语。这个it称为引导词(anticipatory it)，作形式主语，放在谓语动词后的主语是真正的主语。,1,二、it作引导词,2作形式宾语(formal object) 当复合宾语中的宾语是动词不定式、动词ing形式短语、宾语从句时，往往把宾语放在它的补足语后面，而把引导词it放在全句谓语动词和宾语补足语的中间。放在宾语补足语后面的宾语叫真正宾语，放在全句谓语动词和宾语补足语中间的引导词it叫形式宾语。,1,三、it用在强调结构中 当我们要强调句子的某一部分(通常总是主语，宾语或状语)时，常用强调结构。其形式为“it is (was)被强调的部分who (that)句子的其他成分”。在这种结构中，it无实际意义，它只帮助改变一个句子的结构，使某一成分受到强调。,1,使用“It is/wasthat”强调句型要注意的几点： 1被强调部分指人时，其后除了用that之外，也可用who或whom。强调的是主语时，使用who；强调的是宾语时，使用whom。 2强调句的时态 一般说来，原句的谓语动词如果是现在或将来各种时态，则用句型“It isthat (who, whom)”；如果原句谓语动词是过去各种时态，则用句型“It wasthat (who, whom)”。,1,使用“It is/wasthat”强调句型要注意的几点： 3在强调时间、地点、原因或方式状语时，不能用when, where, why或how，只能用that。如： It was because her mother was ill that she didnt go with us. 就是因为她母亲病了，她才没跟我们一起去。,1,使用“It is/wasthat”强调句型要注意的几点：,注意：可用“It is/was becausethat”结构强调because引导的原因状语从句，如上例所示，但不能用该结构强调由since或as引导的原因状语从句，如不能说：It is since everybody is here that lets begin our discussion.也不能说： It was as it was raining hard that they had to stay at home.,1,使用“It is/wasthat”强调句型要注意的几点：,4强调“notuntil”结构 在强调“notuntil”结构中由until短语(或从句)表示的时间状语时，要用固定的强调句型“It is/was not untilthat ”。其中that从句中的谓语动词用肯定式。如：My father did not come until 12 oclock last night. It was not until 12 oclock last night that my father came home. 昨晚直到12点我父亲才回家。,1,使用“It is/wasthat”强调句型要注意的几点：,5在强调一般疑问句中的某一成分时，主句要用一般疑问句的语序。 如：Did this happen in Guangzhou? Was it in Guangzhou that this happened? 此事是在广州发生的吗？,1,使用“It is/wasthat”强调句型要注意的几点：,6特殊疑问句中只有疑问词可以强调，其强调结构是：“疑问词is/was itthat？” 7可以强调宾语补足语，当连系动词不是be，表语部分是名词性词组时，也可使用这种结构强调表语，但是，当连系动词是be时，不能强调表语。,1,使用“It is/wasthat”强调句型要注意的几点：,8强调句的谓语动词除了可采用现在时和过去时的单数形式外，有时根据需要还可采用复杂的形式。 如：It must have been Mary that you saw just now. 你刚才看到的一定是玛丽。,同学们,来学校和回家的路上要注意安全,同学们,来学校和回家的路上要注意安全,