Unit 5 Working the land Discovering Useful Structures 课件-2025-2026学年高中英语人教版选择性必修第一册

主语从句知识点总结 一、主语从句基本概念 主语从句是指在复合句中充当主语的从句，通常放在主句谓语动词之前，或由形式主语it代替，而本身放在句末。 划出下列句子中的主语从句 1. That we must take immediate action to protect the environment is beyond doubt. 2. It is strange that she didn't reply to my email. 3. Whether the new policy will be implemented next month remains unclear. 4. What he mentioned in the speech inspired thousands of young people. 5. It is believed that hard work leads to success. 6. Who will be appointed as the new manager has not been announced yet. 7. How we can reduce air pollution is a question that concerns everyone. 答案 1. That we must take immediate action to protect the environment is beyond doubt. 2. It is strange that she didn't reply to my email. 3. Whether the new policy will be implemented next month remains unclear. 4. What he mentioned in the speech inspired thousands of young people. 5. It is believed that hard work leads to success. 6. Who will be appointed as the new manager has not been announced yet. 7. How we can reduce air pollution is a question that concerns everyone. 二、主语从句的连接词 1. 从属连词 that：只起连接作用，无实际意义，在从句中不充当成分 That he passed the exam surprised everyone. （他通过了考试让每个人都很惊讶） whether：表示“是否” Whether we will go camping depends on the weather. （我们是否去野营取决于天气） 2. 连接代词 - who, whom, whose, what, which, whoever, whatever等- 在从句中充当主语、宾语、定语等成分 What he said is true. （他说的是真的） Who will be our monitor hasn't been decided yet. （谁将成为我们的班长尚未决定） 3. 连接副词 - when, where, why, how, whenever, wherever等- 在从句中作状语 When we will start is still uncertain. （我们何时开始仍不确定） How he solved the problem impressed us all. （他如何解决这个问题给我们所有人留下了深刻印象） 1. ______ she will attend the wedding or not is up to her personal schedule.A. If    B. Whether    C. That    D. What 2. ______ caused the traffic accident is still under investigation.A. That    B. What    C. How    D. Where 3. It is necessary ______ we should learn to adapt to changes.A. that    B. if    C. whether    D. what 4. ______ will represent our company at the international conference is still undecided.A. Who    B. Whom    C. Whose    D. Which 5. It is reported ______ the team has won the championship.A. what    B. that    C. whether    D. how 6. ______ we can finish the project ahead of time depends on our cooperation.A. That    B. If    C. Whether    D. What 7. ______ he solved the complex mathematical problem surprised all his teachers.A. What    B. That    C. How    D. Where 8. It is a pity ______ you missed the valuable lecture.A. that    B. if    C. whether    D. why 9. ______ breaks the school rules will be punished accordingly.A. Who    B. Whoever    C. Whom    D. What 10. ______ the meeting will be held has not been determined yet.A. When and where    B. When and which    C. What and where    D. How and why 1.B  2.B  3.A  4.A  5.B  6.C  7.C  8.A  9.B  10.A 三、形式主语it 当主语从句较长时，常用it作形式主语，将主语从句后置。 常见句型： 1. It + be + 形容词 + that从句 It is obvious that she is right.（很明显她是对的） It is important that we learn English well.（我们学好英语很重要） 2. It + be + 名词 + that从句 It is a pity that you can't come.（你不能来真是遗憾） It is common knowledge that the earth is round.（地球是圆的是常识） 3. It + 不及物动词 + that从句 It seems that he is lying.（似乎他在撒谎） It happened that I was out when he called.（他打电话时我碰巧出去了） 4. It + be + 过去分词 + that从句 It is said that he has gone abroad.（据说他已经出国了） It is reported that the accident killed three people.（据报道事故造成三人死亡） It is + 名词 + 从句 It is a fact that… 事实是… It is no wonder that … 难怪… It is a question that … 是个问题 It is common knowledge that … 是常识 It is no surprise that… 不足为奇的是… 2. It is + 形容词 + 从句 It is necessary that … 有必要…… It is clear that … 很清楚…… It is vital that … 至关重要的是…… It is important that … 重要的是…… It is likely that … 很有可能…… It is essential that … 完全有必要的是…… 3. It is + 过去分词 + 从句 It is said / reported / claimed that … 据说/据报道 It is thought / believed / supposed that … 人们认为 It has been decided that… 已决定…… It is estimated that… 据估计 It is (universally) acknowledged that … 公认…… It is (generally) considered that… 普遍认为 It is (well) known that… 众所周知 4. It + 某些动词 + 从句（固定搭配） It occurred to / struck / hit sb that… 某人(突然)想到… It happened that… 碰巧… It often happens that… …这是常有的事 It doesn’t matter that…… 没关系 It goes without saying that… 不言而喻 四、主语从句的语序 主语从句始终用陈述语序，即使从句表示疑问含义。 - 正确：Where he has gone is unknown.（他去了哪里还不知道） 错误：Where has he gone is unknown. 五、whether与if的区别 在主语从句中，只能用whether，不能用if。 正确：Whether he will come doesn't matter.（他是否来不重要） 错误：If he will come doesn't matter. 六、主语从句的时态 主语从句的时态需根据实际情况选择，但要注意主从句时态的一致性。 It is true that he studied in England.（他曾在英国学习是真的） It was true that he had studied in England.（他曾在英国学习过去是真的） 总结规律 规律一：主语从句一律用陈述语序，即主语在前，谓语在后。 When he will come is not known. 规律二：连词 that 在从句中无实际意义，但不能省略。 That he will not come to the meeting this evening is true. 规律三：whether 可以引导主语从句，放在句首，但 if 不能。 Whether the meeting will be put off has not been decided yet. 规律四：含主语从句的主句谓语动词多用单数形式。 When he will come is a puzzle. 规律五：what 引导的主语从句，可根据表语决定主句动词的单复数形式。What he needs is that book. / What he needs are some books. 规律六：主语从句为了避免头重脚轻现象，用 it 做形式主语，而把从句放在后面。 It's a pity that he didn't come. 很遗憾他没来。 $