Unit 5 Working the Land Learning About Language主语从句&itt形式主语 课件 2026-2027学年人教版高中英语选择性必修第一册

该高中英语课件围绕主语从句展开，系统涵盖定义、连接词、it形式主语五大句型、主谓一致及语序等核心知识点。课堂导入通过名词、不定式、动名词作主语的例句自然过渡到从句作主语，构建新旧知识联系的学习支架，分模块层层递进讲解。 其亮点在于以语言能力培养为核心，通过大量例句和练习题帮助学生理解运用；注重思维品质提升，连接词规则分步骤（看成分、辨含义等）引导分析；强化学习能力，总结“连接词、常考题型、语序”三要素构建知识框架。助力学生掌握语法规则，教师可高效开展教学。

主语从句 subject clause Part 01主语从句的定义 Part 02主语从句的连接词 Part 03it作形式主语五大句型 Part 04主语从句主谓一致原则 Part 06主语从句练习题 Part 05主语从句语序 2 PART 01 主语从句的 定义 PART 01 主语从句的定义 Time is important. 名词作主语 To learn English is necessary. 不定式作主语 句子的主语，一般放在句首，动作的发出者。 Reading benefits us. 动名词作主语 That he will come is certain. 从句作主语 用一个完整的从句充当主句的主语，叫作主语从句，属于名词性从句。 4 Whether we will go camping depends on the weather. What he said surprised everyone. Who will take part in the competition has not been decided. Where we should build the library is still a question. Find out the subject clause 主语从句 PART 01 主语从句的定义 1.作主语 That he will keep his promise is true. 2.作形式主语 it 的真正主语 It is clear what he really wants. 3.用于特殊句式 It is a pity that you can’t join us. 大多数主语从句可以直接置于句首充当句子主语 常用 it 作形式主语，主语从句后置 常用于 “It + be + 名词 / 形容词 + 从句” 固定句型 6 PART 02 主语从句的 连接词 PART 02 主语从句的连接词 从属连词（that /whether） That he made an important speech at the meeting was true.(that不做成分) Whether we go by train or by boat makes no difference.(whether：是否) 注意:主语从句放在句首，只能用 whether，不能用 if Whether he will come is unknown.√ If he will come is unknown.× 在从句中不充当任何句子成分，只起到连接从句的作用。 8 PART 02 主语从句的连接词 连接代词（who /what/which …） 既连接主句从句，同时在主语从句内部充当主语、宾语或者表语。 Who will be the president is still unknown. What we need most is more time. Which is the better choice is still unknown. Whom we will invite has not been discussed. 9 PART 02 主语从句的连接词 连接副词 when /where/how /why 从句句子主谓完整，不缺主语宾语；连接副词在从句充当状语（时间、地点、方式、原因） When we’ll start tomorrow will be told soon. Why he came here is not known. How we finish the task matters a lot. Where we will go has not been decided yet. 从句完整，缺时间、地点、原因、方式 → 选连接副词。 10 PART 02 主语从句的连接词 ①看从句缺不缺成分；缺主 / 宾 / 表→用连接代词 (what/who…)； 缺状语→用连接副词 (where/why…)； ②从句成分完整，只缺 “是否” 含义→whether； ③从句成分完整，无实际含义，只起连接→that； 句首主语从句只能用whether不能用 if 1. Robert, ______we had was a failed experiment in how to effectively carry a milk bottle with two tiny hands. 2. ______ struck me most in the movie was the father’s deep love for his son. 3. ______ one of you breaks the window will have to pay for it. 4. The limits of a person’s intelligence, generally speaking, are fixed at birth, but ______ he reaches these limits will depend on his environment. What Whichever What whether 11 PART 02 主语从句的连接词 5. It is by no means clear ______ the president can do to end the strike. 6. ______ matters most in learning English is enough practice. 7. It is not immediately clear ______ the financial crisis will soon be over. 8. The ties are good in both quality and style; she knows that ______ she chooses will match her husband. 9. It’s no longer a question now ______ man can land on the moon. 10. ______ enters the computer rooms should take off his shoes in order to keep them clean enough. 11. It’s none of your business ______ other people think about you. Believe yourself. what What that Whoever what whether whichever 12 PART 03 it形式主语的 五大句式 PART 03 it形式主语五大句式 1 it 作形式主语，把真正的主语从句放到句子末尾。 2 It + be + 形容词 + 主语从句 That the earth is round is known to all.= It is known to all that the earth is round. it 形式主语（占位，无实际含义） that the earth is round 真正的主语从句 It was surprising that she passed the difficult exam. 形容词为 important /necessary/natural 时，从句谓语要用 (should) + 动词原形，should 可以省略 It is important that we (should) learn English well. 14 PART 03 it形式主语五大句式 3 It + be + 过去分词 + 主语从句 常用过去分词：said（据说）、reported（据报道）、believed（人们相信）、thought（人们认为） It is said that they are identical twins. It is reported that a big earthquake hit the area. 虚拟语气特殊： 分词是 suggested /ordered/required /advised（建议、命令、要求），从句用 (should) do It is suggested that students (should) make their bed by themselves. 15 PART 03 it形式主语五大句式 4 It + be + 名词 + 主语从句 5 6 It + 不及物动词 + 主语从句 It + 及物动词 + 宾语 + 主语从句 常用名词：pity（遗憾）、honor、fact、good news It is a pity that he missed such an interesting film. 动词：seem、happen、appear、turn out、occur It happened that they were out that day. 动词：worry、shock It shocks me that he failed in this exam. 16 PART 04 主语从句的 主谓一致 PART 04 主语从句的主谓一致 主语从句作主语，主句谓语动词用单数。 1.What he said is true. 2. That we should protect nature matters a lot. 3. Whether he will come depends on the weather. 所有由 that / whether / wh-词 引导的单条主语从句，统一视作单数。 18 PART 04 主语从句的主谓一致 两条及以上主语从句并列作主语 → 视作复数，谓语动词用复数(表达两件不同的事、两个不同情况，谓语统一用复数。) What he thinks and what he does are totally different. Where we go and how we go there have not been discussed. 并列从句判单复：两件独立用复数，同一整体用单数 19 PART 05 主语从句 语序 PART 05 主语从句语序 主语从句使用陈述语序：引导词 + 主语 + 谓语 + 其他 Where does he live?（疑问语序） What will she do next?（疑问语序） 主语从句：Where he lives is unknown. What she will do next is a secret. 1. 主语从句，引导词后面先写主语，再写谓语 2. 有 do/does/did 的疑问句变从句，要去掉助动词，动词变回对应时态形式 21 PART 05 主语从句语序 陈述语序 What he likes is unknown. Where she will go hasn’t been decided. Whether we can finish the task matters a lot. 主语从句必须用陈述句语序，即按照“主语+谓语”的顺序。 22 PART 05 主语从句语序 Try to correct What does he like is still a mystery. Where will she go has not been known. How can we solve the problem makes us confused. What he likes Where she will go How we can solve the problem 23 主语从句三要素 连接词 that(无词义，不省略) whether（是否，主语从句不能用 if） 特殊疑问词 who, when, where, what, how… 常考题型 it 作形式主语：用 it 代替真正的主语从句，从句后置，避免头重脚轻。 主谓一致：单个主语从句作主语，谓语动词常用单数。 语序 陈述语序：连接词+主+谓 PART 06 主语从句 练习题 Exercise 1. It remains to be seen ________ the new policy will work. 2. ________ the troubled airline company can survive the current crisis without government bailout remains an open question. 3. ________ we’re fascinated by the sky is evident in ancient tales from around the world, such as ________ of Chang’e. 4. It is reported ________ a new high‑speed railway will be built between the two cities next year. whether That That Whether That Exercise 5.________ makes Naadam popular is that it is a representative folk festival of the Mongolian ethnic group. 6. To Alselwi, ________ matters most is showing these kids that their hard work is seen and appreciated. 7.Technology is constantly advancing. ________ we imagined it years ago cannot keep up with its pace of development. 8. ________ will be sent to work there has not been decided. 9. ________ has a vivid imagination might be convinced of the existence of powerful supervillains (超级反派). What Who what What Whoever Exercise 10. ________ we can get in touch with him is the most important. 11. ________ the next movie marathon will start is decided by our group leader. 12.That football is such a simple game to play ________(be) perhaps the basis of its popularity. 13.Whether we can go on the trip ________(depend) on the weather this weekend. How When is depends $