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Unit 7 A Good Read 核心语法：情态动词表推测&宾语从句否定转移
一、语法精讲
语法点一：情态动词表推测
1. 核心概念
情态动词can't、may、might、must可用于对现在或过去的情况进行推测，语气强度依次递增，常用于阅读场景中推测书中人物身份、情节走向、事件原因等，需根据语境选择对应情态动词，准确传达推测的确定性程度。
例：
The character in the book must be a hero. He always helps others.（书中这个角色一定是个英雄，他总是帮助别人，语气最肯定）；
This story may happen in ancient times. The description fits the period.（这个故事可能发生在古代，描述很贴合那个时期，语气不确定）；
③ She can't have read this novel. She knows nothing about the plot.（她不可能读过这本小说，她对情节一无所知，否定推测）。
2. 情态动词表推测用法对比
must 肯定推测，“一定、必定”（语气最强，90%以上把握） 基于明确证据的肯定推测 【2025年河南中考】The writer must be very experienced. His books are full of deep thoughts.
may/might 可能性推测，“可能、也许”（might语气比may更弱，30%-60%把握） 不确定的肯定推测，无明确证据 【2025年江苏苏州中考模拟】We may read this story in the English class. Our teacher mentioned it yesterday.
can't 否定推测，“不可能”（语气肯定，90%以上把握否定） 基于证据的明确否定推测 【2025年浙江杭州中考】He can't finish the thick novel in one day. It has over 500 pages.
3. 关键用法（易错点突破）
语气差异误区：避免混淆may和must的语气，must表“必然”，may表“不确定”，如The book may be popular（可能受欢迎）≠The book must be popular（一定受欢迎）。
例：【2025年湖北武汉中考】She might like the detective novel, but I'm not sure.
否定推测规范：表否定推测只能用can't，不可用mustn't（mustn't表“禁止”），如不可说He mustn't be at home.，应说He can't be at home.（他不可能在家）。
过去推测结构：对过去情况推测用“情态动词+have+过去分词”，如She may have read the book.（她可能读过这本书了）；They can't have missed the ending.（他们不可能错过结局）。
语法点二：宾语从句的否定转移
1. 核心概念
当主句谓语动词为think、believe、suppose、expect、guess等，且主语为第一人称时，宾语从句的否定需转移到主句，即“否定主句，肯定从句”，用于阅读后表达个人观点、看法，使语气更委婉自然，贴合单元“阅读感悟”场景。
例：
I don't think this book is boring.（我认为这本书不无聊，否定转移到think前，不可说I think this book isn't boring.）；
② We don't believe he has finished reading the novel.（我们认为他没读完这本小说，否定转移，从句用肯定式）。
2. 句型结构与句式转换
肯定句（无转移） I think/believe+肯定从句 1. 主语为第一人称（I/we）时才转移，第三人称不转移；2. 否定转移后，从句用肯定式；3. 疑问句需对应调整语序和语气 【2025年安徽中考】I believe this story is based on a real event.
否定句（转移后） I don't think/believe+肯定从句 【2025年湖南长沙中考模拟】We don't suppose the writer will write a sequel to this book.
疑问句 Do you think/believe+肯定从句？ 【2025年广东广州中考】Do you think this novel is worth reading again
易错提醒：1. 第三人称主语不发生否定转移，如He thinks the book isn't interesting.（他认为这本书没意思，无需转移）；2. 否定转移的反意疑问句，需根据从句内容提问，如I don't think he likes the book, does he （从句是否定含义，反意疑问句用肯定）；3. 不可同时否定主句和从句，如不可说I don't think the book isn't interesting.（双重否定错误）。
二、语法综合练习
（一）单项选择
【2025年河南中考】—Who wrote this poem —It ______ be Li Bai. His style is very special.（ ）
A. must B. may C. might D. can't
【2025年陕西中考模拟】I don't think he ______ the book yet. He just borrowed it this morning.（ ）
A. finish reading B. finished reading C. has finished reading D. will finish reading
【2025年四川成都中考】The story ______ be true. There is no evidence to support it.（ ）
A. must B. can't C. may D. might
【2025年福建福州中考模拟】Do you think the writer ______ a new book next year （ ）
A. will write B. writes C. wrote D. has written
【2025年湖北襄阳中考】She ______ have read the classic novel. She can talk about the characters in detail.（ ）
A. must B. may C. can't D. might not
【2025年江苏南京中考】He doesn't believe that the book ______ popular for so many years.（ ）
A. is B. was C. has been D. will be
【2025年山东青岛中考模拟】—Where is Tom —He ______ be in the library. He often reads there after school.（ ）
A. must B. may C. can't D. mustn't
【2025年浙江宁波中考】I don't suppose they ______ the ending of the story. Let's tell them.（ ）
A. know B. knows C. knew D. have known
【2025年江西中考】The book ______ be Lucy's. Her name is on the cover.（ ）
A. must B. may C. might D. can't
【2025年云南昆明中考模拟】She doesn't think this book is as interesting as that one, ______ （ ）
A. does she B. is it C. doesn't she D. isn't it
（二）用所给词的适当形式填空
【2025年广东广州中考】The novel ______ (must) be Mary's. She has been looking for it everywhere.
【2025年甘肃兰州中考】I don't think he ______ (come) to the book club tomorrow. He has a meeting.
【2025年山西中考模拟】They ______ (can't) finish reading the thick book in two days. It's too long.
【2025年贵州贵阳中考】Do you think the story ______ (happen) in real life
【2025年海南海口中考模拟】She ______ (may) have missed the key part of the book. She looks confused.
【2025年辽宁沈阳中考】We don't believe that he ______ (read) the book before. He knows nothing about it.
【2025年青海西宁中考模拟】The writer ______ (might) write a new chapter next month. He mentioned it in an interview.
【2025年湖北武汉中考】I don't suppose she ______ (like) this kind of detective novel. She prefers love stories.
【2025年江苏苏州中考】He ______ (must) have left the book in the classroom. I saw it there just now.
【2025年安徽中考模拟】They don't think the book ______ (be) popular among teenagers. It's too difficult.
（三）补全对话
对话1（场景：谈论读过的小说）
备选词：must, don't think, may, can't, have read
A: Have you read the novel "Little Women"
B: No, but I ______ it's boring. My sister says it's very moving.
A: Your sister ______ have read it many times. She always talks about the characters.
B: Yes. She says the book ______ be written by a woman writer. The feelings are so real.
A: You're right. It was written by Louisa May Alcott. You ______ miss it. It's a classic.
B: I ______ read it this weekend. I have nothing to do.
对话2（场景：推测书中情节）
备选词：might, don't believe, must, can't, will write
A: I'm reading a mystery novel. The plot is so confusing.
B: Really Who do you think the criminal is
A: I think it ______ be the man next door. He acts strangely.
B: I ______ that. He is too kind to be a criminal.
A: Then who else The woman in the story ______ know the truth. She was there at that time.
B: Maybe. Do you think the writer ______ a surprising ending
A: I'm not sure, but it ______ be a happy ending. Mystery novels usually have sad ones.
（四）按要求改写句子
1. He must be the writer of this book.（改为否定句）
He ______ ______ the writer of this book.
2. I think this book is worth reading.（改为否定转移句）
I ______ ______ this book ______ worth reading.
3. She may have read the novel.（改为一般疑问句）
______ she ______ ______ the novel
4. They believe he will finish the book next month.（改为否定转移句）
They ______ ______ he ______ finish the book next month.
5. The book must be Lucy's.（对划线部分提问，划线部分：Lucy's）
Whose ______ the book ______
6. I don't think he is right.（改为反意疑问句）
I don't think he is right, ______ ______
7. He can't finish the book in one day.（改为过去推测）
He ______ ______ ______ the book in one day.
8. Do you think she likes the story （改为否定转移的宾语从句）
I ______ ______ she ______ the story.
9. The story might happen in the 19th century.（对划线部分提问，划线部分：in the 19th century）
When ______ the story ______ ______
10. She believes the book is interesting.（改为否定转移句并改为一般过去时）
She ______ ______ the book ______ interesting.
三、答案与详细解析
（一）单项选择
A 解析：根据“他的风格很特别”的明确证据，表肯定推测，用must。【2025河南中考考点：情态动词must表推测】
C 解析：yet提示现在完成时，否定转移句中从句用肯定式，用has finished reading。【2025陕西模拟考点：否定转移与现在完成时】
B 解析：根据“无证据支持”，表否定推测，用can't。【2025成都中考考点：情态动词can't表推测】
A 解析：next year提示一般将来时，宾语从句用相应时态，符合语境。【2025福州模拟考点：宾语从句时态】
A 解析：根据“能详细谈论角色”的证据，表过去肯定推测，用must have read。【2025襄阳中考考点：情态动词表过去推测】
C 解析：for so many years提示现在完成时，否定转移句中从句用肯定式，用has been。【2025南京中考考点：否定转移与现在完成时】
B 解析：根据“经常放学后在那读书”的习惯，表不确定肯定推测，用may。【2025青岛模拟考点：情态动词may表推测】
D 解析：否定转移句中，结合语境“让我们告诉他们”，表“还没知道”，用have known。【2025宁波中考考点：否定转移与现在完成时】
A 解析：根据“封面上有她的名字”的明确证据，表肯定推测，用must。【2025江西中考考点：情态动词must表推测】
B 解析：否定转移的反意疑问句，需根据从句内容提问，从句表否定含义，用is it。【2025昆明模拟考点：否定转移反意疑问句】
（二）用所给词的适当形式填空
must 解析：根据“她到处找它”的证据，表肯定推测，用must。【2025广州中考考点：情态动词must表推测】
will come 解析：否定转移句中从句用肯定式，tomorrow提示一般将来时，用will come。【2025兰州中考考点：否定转移与一般将来时】
can't 解析：根据“书太长”，表否定推测，用can't。【2025山西模拟考点：情态动词can't表推测】
happens 解析：宾语从句表客观情况，用一般现在时，主语the story是单数，用happens。【2025贵阳中考考点：宾语从句时态】
may 解析：根据“她看起来困惑”，表不确定推测，用may have read。【2025海口模拟考点：情态动词表过去推测】
has read 解析：否定转移句中从句用肯定式，before提示现在完成时，用has read。【2025沈阳中考考点：否定转移与现在完成时】
might 解析：根据“采访中提到”，表不确定推测，用might。【2025西宁模拟考点：情态动词might表推测】
likes 解析：否定转移句中从句用肯定式，主语she是单数，用likes。【2025武汉中考考点：否定转移主谓一致】
must 解析：根据“刚才在那看到”的证据，表过去肯定推测，用must have left。【2025苏州中考考点：情态动词表过去推测】
is 解析：否定转移句中从句用肯定式，主语the book是单数，用is。【2025安徽模拟考点：否定转移与主谓一致】
（三）补全对话
对话1
答案：don't think; must; must; can't; may
解析：第一空表否定转移，用don't think；第二空根据“总谈论角色”，表过去肯定推测，用must；第三空根据“情感真实”，表肯定推测，用must；第四空表“不可错过”，用can't；第五空表不确定推测，用may，贴合谈论小说的场景。
对话2
答案：must; don't believe; might; will write; can't
解析：第一空根据“行为奇怪”，表肯定推测，用must；第二空表否定转移，用don't believe；第三空表不确定推测，用might；第四空表“会写惊喜结局”，用will write；第五空根据“悬疑小说通常是悲伤结局”，表否定推测，用can't，呼应推测书中情节的主题。
（四）按要求改写句子
can't be 解析：must表肯定推测的否定式用can't be，不可用mustn't。
don't think; is 解析：否定转移到think前，从句用肯定式is。
May; have read 解析：情态动词may引导一般疑问句，保留have read表过去推测。
don't believe; will 解析：否定转移到believe前，从句用肯定式will。
must; be 解析：对所有格提问，用Whose，保留must be表推测。
is he 解析：否定转移反意疑问句，根据从句内容提问，从句否定用肯定is he。
can't have finished 解析：过去否定推测，用can't have+过去分词finished。
don't think; likes 解析：否定转移句，从句用肯定式likes，贴合原句疑问含义。
might; happen in 解析：对时间提问，保留might表推测，用happen in。
didn't believe; was 解析：改为一般过去时，否定转移用didn't believe，从句be动词用was。

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