Unit 3 Sea Exploration Discover Useful Structures 不定式复习 导学案-2026-2027学年人教版（2019）高中英语选择性必修第四册

人教版（2019）选择性必修第四册 Unit 3 Discover Useful Structures 不定式复习 导学案 学情分析 学生在前面几个单元已经接触过不定式作主语、宾语和表语的基本形式，也在课文里见过定语和状语的用法，但考到六种功能混合填空时容易混，尤其是作定语时学生最容易搞不清和所修饰名词的关系。另外see sb do sth不带to这个特殊用法学生也经常忘。这节课就扣着本单元海洋探索的主题，拿长江江豚和深海科考说事，先把形式捋一遍，再放进语境里练。 学习目标 1. 能通过观察例句，归纳不定式作主语、宾语、表语、定语、状语、宾补的六种形式与基本用法。 2. 能在讲长江江豚、深海探测与武汉滨江水域的语境中正确使用不定式。 3. 能区分不定式与动名词作宾语的不同，体会不定式表“目的/将来”的语用功能。 学习重难点 重点：不定式作定语和目的状语的结构与基本用法，以及与所修饰名词/主句的逻辑关系判断。 难点：① 不定式作定语时与所修饰名词的逻辑关系；② 不定式作宾补时与宾语的主动/被动关系判断。 课堂探究 Part Ⅰ Lead-in Look at the scenes of Wuhan and fill in each blank with the correct form of the word in brackets. 1. The Yangtze River is a perfect waterway ______ (explore) by boat in summer. 2. The finless porpoise is said ______ (be) a living symbol of a clean Yangtze. 3. Wuhan scientists boarded the research ship early ______ (study) deep-sea creatures before the voyage. Part Ⅱ Analyze and Identify Task 1 Complete the sentences about Wuhan. Find out the basic form of infinitive. 1. The East Lake Ocean World is a good place ______ (learn) about deep-sea creatures. 2. Chinese scientists plan ______ (launch) another research vessel next year. 3. The best way ______ (understand) the ocean is to dive with a manned submersible. 4. We saw several porpoises ______ (leap) out of the Yangtze near the Wuhan Bridge. 5. The country has set up marine reserves ______ (protect) endangered species. 6. It is important ______ (study) the ocean before we exploit its resources. Task 2 Look at the six sentences above and identify the function of each infinitive. 1. ______ 2. ______ 3. ______ 4. ______ 5. ______ 6. ______ Task 3 Complete the following sentences according to the Chinese hints. 1. 长江是武汉市民夏夜乘船游览的好去处。 The Yangtze is a good waterway for Wuhan residents ______ ______ by boat and ______ on summer nights. 2. 据说明年将下水一艘新的深海科考船。 A new research vessel is said ______ ______ ______ next year. 3. 科学家们早起是为了在日出前记录江豚的活动。 The scientists got up early ______ ______ the finless porpoises before sunrise. 4. 老师鼓励我们多读关于海洋探索的资料。 The teacher encouraged us ______ ______ more about sea exploration. Part Ⅲ Summarize Task 1 Work with your partner to summarize the six functions of infinitives. Basic form: to + v. • Subject (主语): It is + adj. + ____________ • Object (宾语): want / hope / plan / decide + ____________ • Predicative (表语): My dream is ____________ • Attribute (定语): something ____________ / a place ____________ • Adverbial (状语): ... ____________ sth (表目的) • Object complement (宾补): ask / tell / encourage sb ____________ sth 小口诀：不定式作定语找名词 → to do跟在名词后面补充说明它 → 就是定语 注意：see / hear / watch / notice / make / let / have 后面接不带to的不定式作宾补。 Task 2 Which verbs take to do and which take doing? 接to do的动词（记口诀：想要希望决定学习计划同意拒绝承诺）： want, hope, ____________, learn, plan, agree, refuse, promise 接doing的动词（记口诀：享受完成练习介意建议保持想念）： enjoy, finish, practise, ____________, suggest, keep, miss Part Ⅳ Practice Task 1 Fill in the blanks with the correct infinitive form of the words in brackets. 1. The submersible Jiaolong is a perfect tool ______ (explore) the deep sea. 2. Chinese scientists are working hard ______ (map) the floor of the South China Sea. 3. The best time ______ (watch) finless porpoises in Wuhan is early morning. 4. We noticed the porpoises ______ (jump) out of the water near the bridge. 5. It is our duty ______ (protect) the Yangtze and the oceans it feeds. 6. The country decided ______ (build) more research vessels for deep-sea missions. Task 2 Complete the following sentences according to the Chinese hints. 1. 中国科学家计划明年再开展一次深海探测任务。 Chinese scientists plan ______ ______ another deep-sea mission next year. 2. 为了保护长江江豚，湖北实施了十年禁渔。 ______ ______ the finless porpoise, Hubei has enforced a ten-year fishing ban on the Yangtze. 3. 蛟龙号是中国第一台深海载人潜水器，值得一探。 Jiaolong is China's first manned deep-sea submersible and is worthy ______ ______ ______. 4. 老师告诉我们多关注海洋保护，为后代留一个健康的星球。 The teacher told us ______ ______ more attention to ocean protection and ______ a healthy planet for future generations. Part Ⅴ Assess Yourself At the end of this period, are you able to: 1. identify and summarize all six functions of infinitives? 2. use infinitives correctly when describing the Yangtze and deep-sea exploration around Wuhan? 3. tell which verbs take to do and which take doing? 课后作业 1. Write a short passage (80-100 words) about the Yangtze in Wuhan or a Chinese deep-sea submersible. Use at least 4 infinitives. 2. Finish the exercises on Workbook "Reviewing useful structures". 3. Talk about the finless porpoise or Jiaolong with your deskmate, using at least 3 infinitives. 参考答案 Part Ⅰ Lead-in 1. to explore 2. to be 3. to study Part Ⅱ Analyze and Identify Task 1 1. to learn 2. to launch 3. to understand 4. leap 5. to protect 6. to study Task 2 1. attribute 2. object 3. attribute 4. object complement 5. adverbial 6. subject Task 3 1. to travel; sail 2. to be launched 3. to record 4. to read Part Ⅲ Summarize Task 1 Basic form: to + v. • Subject: It is + adj. + to do • Object: want / hope / plan + to do • Predicative: My dream is to... • Attribute: something to do / a place to visit • Adverbial: ... to do sth (表目的) • Object complement: ask sb to do sth Task 2（参考答案） 接to do：want, hope, decide, learn, plan, agree, refuse, promise。 接doing：enjoy, finish, practise, mind, suggest, keep, miss。 Part Ⅳ Practice Task 1 1. to explore 2. to map 3. to watch 4. jump 5. to protect 6. to build Task 2 1. to launch 2. To protect 3. to be explored (= of being explored) 4. to pay; preserve 学科网（北京）股份有限公司 $