Unit 5 Section Ⅱ Discovering Useful Structures(Word学生用书)-【学霸笔记·同步精讲】2026-2027学年高中英语选择性必修第一册（人教版)

该高中英语导学案聚焦主语从句，通过短文语境呈现真实例句导入，系统讲解引导词分类、it作形式主语及语序时态等要点，构建从感知实例到归纳规则再到应用实践的学习支架，衔接语法知识与语言运用。 资料以“形式—意义—使用”三维语法观为指导，通过“感悟—发现—归纳—运用”环节培养学生思维品质，结合单句填空、写作任务提升语言能力，随堂检测与答案解析助力自主学习，有效落实新课标核心素养要求。

Section Ⅱ　Discovering Useful Structures 主语从句 　　Since he graduated from college， he had been in low spirits．What made him upset① was that his mother was always complaining about something．His father had been out of work for a long time．It worried him that their family would get into debt② if he couldn’t find a suitable job．However，what he was thinking about③ was what his parents didn’t understand．They often urged him to look for a job as soon as possible．It was really a problem for him that he didn’t know how to communicate with his parents④．Whether he would find a job in the local factory⑤ was bothering him， for he planned to go to a bigger city． 1.短文中的黑体部分均为从句在主从复合句中作主语，称为主语从句。 2.主语从句一般放在句首，如①③⑤；也可以it作形式主语，如②④。 3.⑤句中的Whether意为“是否”，引导主语从句，不可换成if。 ——运用“形式—意义—使用”相结合的三维动态语法观 一、主语从句的引导词 1.连接词that和whether/if 【先感悟】 ①It has been calculated that the global space economy is increasing by billions of dollars every year．（译林选必三） ②Whether life on other planets does exist is yet to be proved， but the signs are promising．（译林选必三） ③That Shenzhou－22 Manned Spacecraft successfully launched on 25 November 2025 made the whole country excited and proud． 【会发现】 （1）①句中的It是　　　　　　，真正的主语是后面的　　　　　　　； （2）②句中的Whether意为“　　　　”，引导主语从句； （3）③句中的That引导　　　　从句，在从句中不作成分。 【善归纳】 （1）that引导主语从句时，在从句中不充当任何句子成分，也没有词汇意义，只起连接作用，但不可省略。 （2）whether/if引导主语从句时，在从句中不充当任何句子成分，只起连接作用，意为“是否”，不可省略，有时也可用it作形式主语。 Whether the plan will be carried out is still unknown． →It is still unknown if/whether the plan will be carried out． 这个计划是否会被实施还不知道。 【指津】　whether引导的主语从句既可放在句首也可放在句尾。但if引导的主语从句不可以位于句首，可用it作形式主语， if引导的从句后置作真正的主语。 【运用练】　单句语法填空/完成句子 ①It is not a problem 　　　　　　 we can win the battle； it’s just a matter of time． ②　　　　　　 it is beneficial for students to board in the school has been a heated discussion among students． ③　　　　　　　　　　　　 her son was always playing computer games． 儿子总是玩电脑游戏，这位母亲对此很担心。 ④　　　　　　　　　　　　 doesn’t matter too much． 她来不来都无关紧要。 2.连接代词 【先感悟】 ①Dad thinks I am a narcissist， but what I say is that my pictures aren’t hurting anyone， so who cares？（外研选必三） ②Whatever you do in your spare time should do no harm to others． ③Who will go to the concert is not known． ④Whoever shows great interest in cycling is qualified to participate in the competition． 【会发现】 （1）①句中的what在从句中作　　　　； （2）②句中的Whatever在从句中作　　　　； （3）③句中的Who在从句中作　　　　，引导的主语从句表示一件“　　　　”； （4）④句中的Whoever在从句中作　　　　，引导的主语从句指“　　　”。 【善归纳】 连接代词（who、whose、whom、what、which、whichever、whoever、whomever、whatever等）引导主语从句，在从句中可以作主语、宾语、表语或定语。 【运用练】　单句语法填空/完成句子 ①　　　　　　 surprises us most is that you are confident and brave on the stage when facing plenty of audience． ②To be honest， 　　　　　　 I admire most is your diligence and determination． ③　　　　　　　 had seemed like an impossible task has now been accomplished． ④　　　　　　 is interested in the photography exhibition is welcome to participate． ⑤　　　　　　　　　　　　 is difficult to guess， because the two players are equal with each other． 谁会赢得比赛很难猜测， 因为两位选手平分秋色。 3.连接副词 【先感悟】 ①How anyone could be formed in such a way was beyond her comprehension．（外研选必三） ②When we will have a meeting is an important question． 【会发现】 ①句中的How和②句中的When在从句中作　　　　。 【善归纳】 连接副词（when、where、how、why、whenever、wherever、however等）引导主语从句并在从句中作状语。 【指津】　名词性从句引导词的确定步骤： （1）分析句式结构，明确名词性从句在句中的功能； （2）明确名词性从句所表达的意义； （3）明确名词性从句中所需要的成分及意义； （4）确定从句的引导词。 【运用练】　完成句子 ①　　　　　　　　　　　　　　　　 in our study is very important． 我们如何应对学习中的挫折是极其重要的。 ②　　　　　　　　　　　　　　　　 depends much on the weather． 延误的航班什么时候起飞很大程度上取决于天气。 ③　　　　　　　　　　　　　　　　 is none of your business． 我在哪里过暑假不关你的事。 二、it作形式主语的主语从句 【先感悟】 ①It’s true that inner beauty is very important， but external beauty shouldn’t be completely overlooked．（外研选必三） ②It is an honour that I was invited to your birthday party． ③ It is required that the applicants should be fluent in English， and knowledgeable about our school history． ④For example， it can be proved that China has more people than any other country in the world except for India． 【会发现】 上述句中的it是　　　　　　，真正的主语是后面的　　　　。 【善归纳】 1.It＋be＋形容词（obvious、 true、 natural、 strange ．．．）＋主语从句 【指津】　在“It＋be＋形容词＋主语从句”结构中，若形容词为important/necessary/strange等，主语从句中的谓语动词用“should＋动词原形”形式，其中should可省略。 2.It＋be＋名词词组（no wonder、an honour、a pity、a/no surprise ．．．）＋主语从句 3.It＋be＋过去分词（said、reported、thought、expected、proved ．．．）＋主语从句 【指津】　在“It＋be＋过去分词＋主语从句”结构中，过去分词若为suggested/ordered/required/advised等，主语从句中的谓语动词用“should＋动词原形”形式，其中should可省略。 4.It＋动词或动词短语（happen、seem、appear、remain、turn out ．．．）＋主语从句 5.It＋及物动词＋宾语＋主语从句 【运用练】　句型转换 ①That he suddenly fell ill last month surprised us． →　　　　　　　　　　 he suddenly fell ill last month． ②Whether they will sell the house hasn’t been decided yet． →　　　　　　　　　　　　　　　　 they will sell the house． ③That English is the most widely used language in the world is known to all． →　　　　　　　　　 that English is the most widely used language in the world． 三、主语从句的语序和时态问题 【先感悟】 ①That the earth moves around the sun is known to us all． ②Whether the workers had completed their tasks was not clear． ③Who would win the game was hard to predict． ④When the meeting will be held has not been decided yet． ⑤How he has managed to solve the problem is unknown． 【会发现】 上面句子中的黑体部分均为主语从句，它们的语序均是　　　　语序；这些句子的时态需要根据　　　　来确定。 【善归纳】 1.主语从句和其他名词性从句一样必须使用陈述语序，尤其是当主语从句是疑问词引导的时候，主语从句的语序仍须使用陈述语序。 2.一般情况下，单个主语从句作主语时，谓语动词用单数形式。 3. 如果由and连接两个或两个以上的主语从句作主语时， 谓语动词用复数；由两个或多个连接词引导一个主语从句时， 谓语动词用单数。 When they will start and where they will go have not been decided yet． 他们什么时候动身以及要去哪里还没定下来。 4.如果连接代词what在主语从句中作主语，且其所指代的内容为复数意义时，谓语动词用复数。 What we need most for the project are some plastic materials． 我们这个项目最需要的是一些塑料材料。 【运用练】　单句语法填空 ①Whether it will do us harm or good 　　　　　　 （remain） to be seen． ②What surprised me most 　　　　　　 （be） that the man in rags was a millionaire． ③What makes it different from others 　　　　　　 （be） that the vegetables here are grown without any chemical fertiliser． ④When and where the meeting will be held 　　　　　　　　 （decide） already． ⑤How and why he came to this city 　　　　　　 （be） a story of struggle and success． ⑥What are used as chief building materials today 　　　　　　　 （be） steel and concrete． Ⅰ．单句语法填空 1.　　　　　　 you eat more fresh vegetables and fruit and avoid food high in fat and sugar is urgent． 2.　　　　　　 I’m concerned about most is whether we can collect a huge amount of information in such a short time． 3.　　　　　　 the new road is open to traffic has not been made clear． 4.　　　　　　 people cut down too many trees destroys the balance of nature． 5.　　　　　　 is interested in this activity can sign up for it right now． 6.It remains unknown 　　　　　　 organic food is really better for people． 7.　　　　　　 made him remarkable as a photographer was his skill in capturing the moment． 8.In fact， it is true 　　　　　　 we have to make our own decisions whether to buy organic food or not． Ⅱ．语法与写作 1.To improve your reading skills， 　　　　　　　　　　 you should read as many Chinese books as possible． 为了提高你的阅读能力， 你有必要尽可能多地读中文书。 2.　　　　　　　　　　 is welcome to share anything related to science with us． 任何对科学感兴趣的人都欢迎与我们分享任何与科学相关的事情。 3.　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 is known to all． 众所周知， 我们的城市正在努力为我们创造一个更好的生活环境。 4.（2024•新课标Ⅰ卷）I’m writing to share with you the art class in the garden last Friday．　　　　　　　　　　 truly broadened my horizons． 我写信是想和你分享上周五在花园里的美术课。那里发生的事确实开阔了我的视野。 5.　　　　　　　　　　 only with joint efforts to protect oceans can we have a bright future． 我坚信只有通过共同努力保护海洋我们才有美好的未来。（it作形式主语） 完成课后作业　UNIT 5　Section Ⅱ 答案 Section Ⅱ　Discovering Useful Structures 【单元语法•轻松过】 一、1.会发现　（1）形式主语；that引导的从句　（2）是否　（3）主语 运用练　①whether　②Whether　③It worried the mother that　④Whether she is coming or not 2.会发现　（1）宾语　（2）宾语　（3）主语；事情　（4）主语；人 运用练　①What　②what　③What　④Whoever　⑤Who will win the first 3.会发现　状语 运用练　①How we can deal with frustration　②When the delayed flight will take off　③Where I spend my summer vacation 二、会发现　形式主语；从句 运用练　①It surprised us that　②It hasn’t been decided yet whether　③It is known to all 三、会发现　陈述；语境 运用练　①remains　②was　③is　④has been decided　⑤is　⑥are 【随堂检测•验成效】 Ⅰ．1.That　2.What　3.When　4.That　5.Whoever 6.whether　7.What　8.that Ⅱ．1.it is necessary that 2.Whoever is interested in science 3.That our city is trying to create a better living environment for us 4.What happened there 5.It is my firm belief that 6 / 6 学科网（北京）股份有限公司 $