Unit 1 Science and Scientists Discover useful structures 课件-2025-2026学年高中英语人教版选择性必修第二册

Discovering useful structures UNIT 1 SCIENCE AND SCIENTISTS 在复合句中，位于_________之后，充当________的名词性从句称作表语从句。 表语 系动词 可以接表语从句的系动词有: 状态系动词 be; 感官系动词 feel, look, sound, taste, smell; seem, appear 持续系动词 remain, keep, stay、lie、stand; 变化系动词 become, get, grow, turn, go, come, run, fall; 终止系动词 prove, turn out. 表语从句的概念 In general, doctors in those days had two contradictory theories to explain how cholera spread. One theory was ______ bad air caused the disease. Another was ______ cholera was caused by an infection from germs in food or water. (Para. 2) What is more, in another part of London, a woman and her daughter had died of cholera after moving away from Broad Street. It seemed ______ the woman liked the water from the pump so much that she had it delivered to her house every day. (Para. 3) 一、that 引导的表语从句 that that that In general, doctors in those days had two contradictory theories to explain how cholera spread. One theory was ______ bad air caused the disease. Another was ______ cholera was caused by an infection from germs in food or water. (Para. 2) What is more, in another part of London, a woman and her daughter had died of cholera after moving away from Broad Street. It seemed ______ the woman liked the water from the pump so much that she had it delivered to her house every day. (Para. 3) 一、that 引导的表语从句 that that that that ____ 意义，在表语从句中 ______ 成分,起______ 作用，________ 省略。 无 不充当 连接 不能 The question is _________ we can rely on him. He often tells lies. The question is _________ we can finish the task on time, for we have only three days left. 二、whether 引导的表语从句 whether whether The question is _________ we can rely on him. He often tells lies. The question is _________ we can finish the task on time, for we have only three days left. 二、whether 引导的表语从句 whether whether 思考：可以用“if”来引导吗？ 连接词whether起 _____ 作用，意为“_________________”，在句中也不作任何成分（注意：if ______引导表语从句)。 连接 是否、究竟、到底 不能 三、what, which, who, whom, whose 等引导的表语从句 Tom is no longer _______ he used to be. The question is _______ of us should come first. (我们两个中的哪一个) The problem is ______ is really fit for the hard job. The important thing is _______name should be put on the top of the list. what which who whose 三、what, which, who, whom, whose 等引导的表语从句 Tom is no longer _______ he used to be. The question is _______ of us should come first. (我们两个中的哪一个) The problem is ______ is really fit for the hard job. The important thing is _______name should be put on the top of the list. what which who whose 连接代词 what, which, who, whom, whose 除在句子中起 ______ 作用外，还可在从句中作 _____、_____ 或 ______，且各有词义。 连接 主语 表语 定语 四、where, when, why, how 引导的表语从句 That’s _______ I can’t agree with you. This is ______ Sara was late for the meeting. (She missed the early bus.) This is _____ they overcome the difficulties. My strongest memory is ______ I attended an American wedding as a child. where why how when 四、where, when, why, how 引导的表语从句 That’s _______ I can’t agree with you. This is ______ Sara was late for the meeting. (She missed the early bus.) This is _____ they overcome the difficulties. My strongest memory is ______ I attended an American wedding as a child. where why how when 连接副词where, when, why, how除在句中起______ 作用外，在从句中还充当_______、______、______或______状语，本身具有词义。 连接 时间 地点 方式 原因 It seems __________________ he doesn’t know the answer. It looks __________________ it is going to rain. 五、as if / as though 引导的表语从句 as if / as though as if / as though It seems __________________ he doesn’t know the answer. It looks __________________ it is going to rain. 五、as if / as though 引导的表语从句 as if / as though as if / as though as if / as though 引导的表语从句常置于_________ look, seem, sound,be,become 等_________。 系动词 后面 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. that that Attention 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. that that 当主句的主语是 _____________ 或 why 引导的 __________时常用 ______ 来引导表语从句，而不用 because。 the reason 主语从句 that Attention 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. why because why that Attention 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. why because that / this / it + is / was +why + ________ (原因 / 结果) 表示“_________________________” that / this / it + is / was + because + _______ (原因 / 结果) 表示“________________________” the reason why … is that … 中 why 是引导 _________，that 引导的是 _________，表示“___________________”。 这 / 那就是……的原因 结果 这 / 那就是因为…… 原因 why that 定语从句 表语从句 ……的原因是…… Attention 6. My suggestion is that we ____________ (go) and help him. 7. My advice is that we ____________ (get) there by train. (should) go (should) get Attention 6. My suggestion is that we ____________ (go) and help him. 7. My advice is that we ____________ (get) there by train. (should) go (should) get 当主句的主语是表示建议（suggestion, advice）、命令（order）、要求（request, proposal）、计划（plan）等的名词时，表语从句要用虚拟语气，即（should）+ 动词原形。 Attention 1. My worry is if he can get there on time. 2. The reason why he failed was because he hadn’t studied hard. 3. My advice is that he sees the doctor right away. 4. The trouble is what we are short of money. that whether that see 即学即练 改错 Practice and Apply $