Unit 5 Working the land Discovering Useful Structures 课件-2026-2027学年高中英语人教版选择性必修第一册

该高中英语课件聚焦主语从句，通过对比含主语从句与名词短语的例句导入，引导学生感知功能差异，进而系统讲解概念、引导词分类、形式主语it及注意事项，构建从感知到应用的学习支架。 其亮点是以袁隆平事迹为语境，例句和练习融入农业科技主题，培育文化意识。通过引导词分类对比、形式主语句型归纳，提升思维品质，强化语言能力。学生能在真实语境中掌握语法，教师可直接使用系统练习提升教学效果。

Unit 5 Working the Land Discover Useful Structures 人教版2019选择性必修第一册 张玉杰 Lead-in What are the functions of the underlined parts in the following sentences? What is the difference between them? What impresses people most about Yuan Longping is his ongoing ability to fulfil his dreams. Yuan Longping’s ongoing ability to fulfil his dreams impresses people most. a clause as subject Subject Clause 在英语中，有的从句在复合句中的作用相当于名词，称作名词性从句。 主语从句，简单来说，就是用一个从句来充当整个复合句的主语。 That he fears no difficulties is a defining trait of Yuan Longping. Subject Clause a clause as subject 概念 引导词分类 1. 从属连词 (不充当从句成分) 引导陈述事实的主语从句，无实际意义，在句首时不可省略。 that: That she left without saying goodbye surprised everyone. （她不辞而别，这让所有人都很惊讶。） 引导词分类 1. 从属连词 (不充当从句成分) 表示“是否”，引导含疑问意义的主语从句。注意：位于句首时只能用 whether，不能用 if。 whether Whether she will come tomorrow is still unknown. （她明天是否会来仍然是个未知数。） 引导词分类 2. 连接代词 (在从句中充当主语、宾语、表语或定语) 指事物，意为“……的东西/事情”或“无论什么”。 what / whatever What concerned him most was that farmers often had poor harvests and sometimes even had a serious shortage of food to eat. Whatever she does is meaningful to her. 这类词有实际含义，且在从句中必须充当一个成分。 引导词分类 2. 连接代词 (在从句中充当主语、宾语、表语或定语) 指特定范围内的事物，意为“哪一个”或“无论哪一个”。 which / whichever Which book you choose matters little.（你选哪本书并不重要。） 引导词分类 2. 连接代词 (在从句中充当主语、宾语、表语或定语) 表示所属关系，意为“谁的”，在从句中作定语。 whose Whose car was stolen is still under investigation. （谁的车被偷了仍在调查中。） 引导词分类 3. 连接副词 (在从句中充当状语) when / where / why / how: 分别表示“何时/何地/为何/如何”。 When the meeting will start has not been announced. How he solved the problem amazed us all. How this could be done was a challenging question at the time 形式主语 it：从句后置 当主语从句较长时，英语习惯用 it 放在句首作形式主语，而将真正的主语（从句）移到句尾，使句子更平衡。 It is an admirable quality of Yuan Longping that he dares to face all difficulties. 敢于直面一切困难是袁隆平令人敬佩的品质。 结构： It + 谓语 + 其他 + [真正的主语从句] 形式主语 it：从句后置 主要有以下几种句型 It is clear that he lied to us. 很明显，他对我们撒了谎。 It is unknown whether she will win the prize. 她是否能获奖是未知的。 1. 句型： It + be + 形容词 + 主语从句 形式主语 it：从句后置 主要有以下几种句型 It’s a pity that you missed the party. 很遗憾你错过了派对。 It is still a question when we shall have a sports meeting. 我们什么时候举行运动会仍然是个问题 2. 句型： It + be + 名词 + 主语从句 形式主语 it：从句后置 主要有以下几种句型 It is reported that the storm will hit the coast. 据报道，风暴将袭击海岸。 It is estimated that about 60 percent of domestic rice consumption in China is comprised of crops generated from Yuan’s hybrid strains. 3. 句型： It + be + 过去分词+ 主语从句 形式主语 it：从句后置 主要有以下几种句型 It seems that she is unhappy today. 她今天似乎不开心。 4. 句型： It + 不及物动词+ 主语从句 关键注意事项 1. 主谓一致 That he likes painting is known to all. 主语从句作主语时，主句的谓语动词通常用单数。 如果从句本身表达的是复数概念，谓语动词则用复数。 What we need are books and pens. （我们需要的是书和笔。） 关键注意事项 2. 引导词省略 That he likes painting is known to all. 位于句首的主语从句，其引导词 that 绝对不能省略。只有在 it 作形式主语的结构中，that 才可以考虑省略（但在正式文体中建议保留）。 He likes painting is known to all. 关键注意事项 3. whether vs. if ✅ Whether he can finish on time depends on himself. ❌ If he can finish on time depends on himself. 表示“是否”时，如果主语从句位于句首，必须用 whether，不能用 if。 关键注意事项 4.陈述语序 ✅ Whether it will do us harm or good remains to be seen. ❌ Whether will it do us harm or good remains to be seen. 主语从句内部必须使用陈述语序，即“引导词 + 主语 + 谓语”，而不是疑问语序。 Have a try 用合适引导词填空（that /what/how /whether/who） 1. ________ worried Yuan Longping was the lack of food for farmers. 2. ________ he could grow high-yield rice remained unknown at first.It is clear 3. ________ Yuan devoted all his life to rice research. 4. ________ hybrid rice would solve the food problem was hotly discussed. What How That Whether Have a try 用合适引导词填空（that /what/how /whether/who） 5. ________ respects Yuan Longping all admires his perseverance. 6. ________ makes him keep working is his love for farmers. 7. It shocked people ________ he still worked in the field in old age. 8. ________ we can increase rice output needs continuous research Whoever What That How Have a try 句型转换（改为 It 作形式主语） 1. That he fears no hardships is his most valuable quality. 2. What he aims for is to feed more people. 3. Whether rice output can be raised quickly is a big question. It is his most valuable quality that he fears no hardships. It is a big question whether rice output can be raised quickly. It is his aim to feed more people. Have a try 翻译题（必须使用主语从句） 1.最让袁隆平担忧的是农民粮食短缺。（句首 what 主语从句） 2. 他敢于直面一切困难是他的典型特质。（that 句首主语从句） 3. 如今，据估计杂交水稻养活了数亿人。（it 形式主语 that 从句） 4. 我们能否培育更高产的水稻仍需要不断探索。（whether 主语从句） What concerned Yuan Longping most was that farmers suffered food shortages. Today, it is estimated that hybrid rice feeds hundreds of millions of people. That he dares to face all difficulties is his defining trait. Whether we can develop higher-yield rice requires constant research. Unit 5 Working the Land Unit 5 Thank You ! Discover Useful Structures 新人教选必一 $