Unit1 Science and Scientists Discover Useful Structures 表语从句课件-2025-2026学年高中英语人教版选择性必修第二册

Predicative Clauses 表语从句 1 表语从句的定义 The question is who will do it. The question is difficult. （ 表 ） 表语从句 （ 表 ） 在复合句中做表语的从句，叫做表语从句。它位于主句的系动词之后，对主语进行解释说明，使主语的内容具体化。采用陈述语序。 2. 表语从句的构成 主语 + 系动词 + 引导词 + 简单句 This is why he did it. What I want to say is that I am tired. 表语从句 可以接表语从句的系动词有： 1. 状态系动词：be 2. 感官系动词：feel , seem , look, appear ,sound, taste , smell 3. 持续系动词：stand , lie , remain ,keep, stay 4. 变化系动词：become ,get , grow , turn , go , come, run, fall 5. 终止系动词：prove, turn out 是 ......起来 保持 变得 证明是...... 结果是...... 她似乎是为了变得好看才保持身材的。 3. 引导词 从属连词：that / whether /as if /as though (if不引导表语从句) 连接代词：who / whom / whose / which/what 连接副词：when / where / why / how 5 1. The fact is that she took out her frustrations on her son. 2. What I can see is that the police are trained to defend themselves. 3. The question is whether they could handle the problem. 4. He looked as if he had seen a ghost. 5. He felt frustrated. That is because he failed in the exam. 表语从句的从属连词有that, whether, as if, as though, because, 他们在从句中_____成分。 that在表语从句中_______实际意义，陈述一个 ， ______省略； whether在表语从句中_______实际意义，______省略； 与if替换，。 if不引导表语从句。 as if, as though在表语从句中_______实际意义，______省略； because在表语从句中_______实际意义，______省略； 不做 没有 不可 有 不可 有 不可 有 不可 是否 似乎/好像 因为 1. 从属连词 确定的事实 不可 从属连词-as if/ as though as if/as though 引导的表语从句常跟在look, sound,seem, feel等后面, 意思为：“看起来/听起来/似乎+ 就好像...” 语气： 若表示真实情况，用陈述语气。 若表示非真实情况，用虚拟语气。 Dark clouds are gathering. It looks as if it’s going to rain. It sounded as if the night would never end. 真实情况 非真实情况 Bradley Hand ITC 7 1. It sounds as if someone ___ knocking at the door. 2. Tom likes to talk big as if he ______ an important person. (对现在的虚拟，用一般过去时，be动词用were) 3. He opens his mouth as if he ________ say something. (对将来的虚拟，用would/could/might+do) 4. He talked about Rome as if he ___________ there. (对过去的虚拟，用had done) (与事实相符) is were would had been 辨析3: as if/as though 引导从句的虚拟语气： 若跟现在事实不符：过去式（be动词用were） 若跟将来事实不符：would/could+动词原形 若跟过去事实不符：had done 从属连词-as if/ as though 1) The reason why he is late for school is ________ he missed the bus. 2) Why we decided to put off the football match is ________ the weather was too bad. 3) I think that’s _____ he was so angry. 4) I think it is ________ you are doing too much. 5) The reason ______ he was so late is _____ it was raining hard. that that why because why that That / This / It + is +why + ________ (原因 / 结果) 表示“_________________________” That / This / It + is + because + ______ (原因 / 结果) 表示“________________________” The reason why … is that … 中 why 是引导 _________，that 引导的是 _________，表示“___________________”。 原因 这 / 那就是……的原因 结果 这 / 那就是因为…… 定语从句 表语从句 ……的原因是…… 问题分析与判断 1) My suggestion is that we ____________ (go) and help him. 2) My advice is that we ____________ (get) there by train. (should) go (should) get 辨析2：当主句的主语是表示建议（suggestion, advice）、命令（order, command）、要求（request, desire, requirement, demand, proposal）等的名词时，表语从句要用虚拟语气，即（should）+ 动词原形。 虚拟语气 连接代词 who谁 / whom / whose谁的 / which哪一个 / what什么 连接代词在表语从句中可充当主语、宾语、表语或定语。“缺什么补什么”：根据从句句意与所缺成分确定连接词 ① This is _______ my teacher has taught me — honesty. ②The problem is _______ can take the place of Jim. ③What I want to know is _______ words are helpful. what who whose 1) China is no longer _______ she used to be. 2) The question is _______ of us should come first. (我们两个中的哪一个) 3) The problem is ______ is really fit for the hard job. 4) The important thing is _______name should be put on the top of the list. 5）You can be __________ you want to be. what which who whose whoever 即学活练 1. Next sunday is we shall meet. 2. You are saying that everyone should be the same, and this is I disagree. 你说每个人都应该一样，这就是我不同意你的地方。 3. The question is __________we can get in touch with him. 问题是我们怎样才能和他联系上。 4. The rain is too heavy. That is _________ I got wet. 那就是为什么我被淋湿了的原因。 where how why when 表语从句的连接副词有when, where, why, how在从句中分别充当 . 时间状语、地点状语、原因状语、方式状语 I disagree with you in this aspect/point. 连接副词 小结： 1. 表语从句的构成: 引导词+简单句 2. 引导词: ｛ 连词：that, whether, as ,as if 连接代词：who, what, which.whom 连接副词：when, where, how ,why 3. 3个注意点: ②if 不引导表语从句 ③语序 ①that引导表语从句时不能省略 A: Absolutely ! You may not believe it, but that was _______ happened at the initial stage of our group's research on developing a vaccine for malaria. B:Yes, it is. And it seemed____________all the theories were useful, but the fact was_________we couldn't persuade one another that one theory was better than another. C:Exactly The problem was not about__________all our theories were equally good, but in deciding________theory to depend upon. D:We realised that what we cared about was not__________aspect we needed to develop a theory in, but rather _____________we can reduce the cost of a vaccine without reducing its effect! E: You're right. At last, we became focused on the key issue, which was _________we had to carry out the research in the first place. what as if that whether whose which how why as if that what who when how why whose which whether Practice Thank you! Unit 1 learning About Language build up your vocabulary Find the words from the previous pages with the following prefixes or suffixes. Then add two more words for each prefix or suffix, and explain their meanings. Prefix Words 重复re-   否定dis-   reunite, revise, recover, react, recall discover, disappear, dislike, disable 微观的micro-   移动trans-   microscope, microwave, microphone transform, transport, transplant Suffix Words Suffix Words -ory adj.具有.....性质的 n.物，场所   -ial adj.....的   -ion n.行为或状态   -ology n.....学   epidemiology, physiology, 心理学 biology生物学 contradictory, satisfactory factory infection, contribution, competiton, reaction, congratulation, collection substantial, official, financial, essential Make phrases by combining the words in the left box with those on the right. Then complete the sentences using these phrases. . 1. Many scientists _____________ the view that it is human activity that has caused global warming. 2. He was to ___________ the accident because he drove on the wrong side of the road. subscribe suspect blame link subscribe to blame for to of for 3. The man ________________ being behind the robbery 抢劫was seen crossing the street. 4. Since heart disease is often ___________ our lifestyle choices, we need to make healthy living an important part of our lives. suspected of linked to Replace the underlined parts with suitable words from the box. It is not unusual for an athlete to be well known while he is active, and quickly forgotten when his athletic career is over. 2. I'm sure she'll deal with the changes very well because she's very adaptable. a household name handle raw, a household name, substantial, statistics, handle 3. He was ready to serve dinner to his friends when he realized that he had forgotten to turn on the oven and the meat was not cooked yet. 4. He used his great influence to change the thinking of the scientific community on this issue. 5. Scientists have collected more data than expected to prove the theory. raw substantial statistics Read this passage about medical science. Complete it using the words below. UK scientists believe they may have found a way to fight the common cold. It blocks a key protein in the body's cells that is to _______ for the spread of cold-causing virus. Targeting the host rather than the _________ was a bit non-traditional but made sense because it was tricky to target the virus. Cold-causing virus are not only of _________ kinds, they also ___________ rapidly, meaning they can quickly develop resistance to medicine. Researchers are working on making a form of medicine that can be taken directly into one's lungs, to _________ the chance of side effects. Though these scientists have made __________ advances in their research, further _______ is needed to make sure such drugs are not so _________ that they harm the body. blame infection, multiple, decrease, severe, transform, proof, blame, substantial infection multiple transform decrease substantial proof severe that where as if/as though why that whether because what 255744.0 $