(共73张PPT)
Unit 8 It must belong to Carla．
九年级
人教版
全
语法讲练及解析
【知识导图】
【要点拓展】
1．表示肯定的猜测时，must可能性最大，can／could次之，may／might最小。
2．表示否定的猜测时can’t／couldn’t语气最强，指“不可能”；may not／might not语气最弱，指“可能不”。
3．在反意疑问句中，当谓语动词含有must／might／can等表推测意义时，疑问部分的助动词应与情态动词后面的动词在非推测情况下的用法保持一致。
She must be a driver，isn’t she？她一定是个司机，是吗？
It must have rained last night，didn’t it？昨晚一定下雨了，是不是？
4．在特定语境中，一些“情态动词＋have done”具有一定感彩。
（1）ought to／should have done本该做，却未做；oughtn’t to／shouldn’t have done 本不该做，却做了（含责备之意）
例：You shouldn’t have done that，I had warned you of that several times.我已多次警告你，你本不该那么做的。
（2）might have done本可以做，却没做（表很委婉的责备）
例：You might have phoned me，though you were busy then.你再忙也该给我打个电话。
（3）could have done本可能，却没有
例：He could have caught the early bus， but he was delayed by helping a stranger.他本能够赶上早班车，但因为帮一个陌生人而晚点。
（4）would（not）have done 本想做，却没做／本不想做，却做了
例：I would have helped you，but I was too busy.我本想帮你，可我太忙了。
【奇思巧计】
【同步检测】
一、单项选择
1. -Whose jeans are these
-They______be John's. They are much larger than his.
A. might B. must C. can't
【答案】C
【详解】句意：-这是谁的牛仔裤？-不可能是John的。这比他的大得多。
考查情态动词表推测。might可能；must一定；can＇t不可能。根据“They are much larger than his.”，可知牛仔裤不可能是John的，表示可能性为零的推测，用can＇t。故选C。
2. -I think Mr Zhang may be in his office.
-No, he ______ be there. I saw him_______just now.
A. needn't; left B. mustn't; leaving C. can't; leave D. shouldn't; left
【答案】C
【详解】句意：-我想张先生可能在办公室。-不，他不可能在那里。我刚才看见他离开了。
考查情态动词辨析和非谓语动词。needn＇t不需要；mustn＇t禁止；can＇t不可以；shouldn＇t不应该。根据“I think Mr Zhang may be in his office.”以及“No，he...be there.”可知，此处表示“不可能在”，应该用can＇t；see sb.do sth. 意为“看到某人做了某事”，由“just now”可知，此处表示“看见他离开了”，因此第二个空用动词原形。故选C。
3. -Sam, go to open the door, please. It______be your sister.
-No, Dad. It ____be her. She will be back after four o'clock.
A. May; mustn't B. must; can't C.must; mustn't
【答案】B
【详解】句意：-山姆，请去开门。一定是你姐姐。-不，爸爸。不可能是她。她四点钟后回来。考查情态动词。May可能，mustn＇t禁止；must一定，必须，与be连用时，表示肯定推测，can＇t不能，与be连用时表示“不可能”。根据答语“No，Dad.”可知第一空是肯定推测，用must，根据“She will be back after fouro＇clock.”可知第二空是否定推测，用can＇t。故选B。
4. David ______ be at home, for no one answers the phone.
A. must B. mustn't C. can D. can't
【答案】D
【详解】句意：大卫不可能在家，因为没有人接电话。
考查情态动词。must必须；mustn＇t禁止；can能；can＇t不可能。根据“for no one answers the phone.”可知没有人接电话，所以他不可能在家，用can＇t。故选D。
5. It______be Lingling's book, but I'm not sure. Liu Hui likes reading, too.
A. can't B. must C. could
【答案】C
【详解】句意：这可能是玲玲的书，但我不确定。刘辉也喜欢读书。
考查情态动词表推测。can＇t不会；must必须；could可能。根据“It...be Lingling＇s book，but I＇m not sure.”可知，此处指的是“我”不确定这是不是玲玲的书，空处应用could表示“可能是玲玲的书”。故选C。
6. --There is someone knocking on the door. I wonder who it ______ be.
-It_______be Frank. He phoned to tell me he would come to our home soon.
A. must; mustn’t B. could; must C.might; can't D. might; mustn't
【答案】B
【详解】句意：-有人在敲门。我想知道是谁。-一定是弗兰克。他打电话告诉我他很快就会来我们家。考查情态动词。must一定；could可能；might可能；can＇t不可能；mustn＇t禁止。根据“There is someone knocking on the door.I wonder who it...be.”可知，空格处要填表推测的情态动词，表示可能，故填could或might；根据“He phoned to tell me he would come to our home soon.”可知，空格处要填must表示肯定推测。故选B。
7. -Where is Linda
- I'm not sure. She ______ in the school library.
A. could be B. must be C. can't be D. will be
【答案】A
【详解】句意：-Linda在哪里？-我不确定。她可能在学校图书馆。
考查情态动词辨析。could be可能是；must be一定是；can＇t be不可能是；will be将是。根据“I＇m not sure”可知应是猜测的可能性不大，故选A。
8.-Maybe she is a teacher.
--No, she ______be. She _______be a nurse because I saw her in uniform in the hospital.
A. mustn't, maybe B. can't, could C. mustn't, must
【答案】B
【详解】句意：-她可能是位老师。-不，她一定不是。她可能是一名护士，因为我看到她在医院里穿护士服。
考查情态动词。mustn＇t禁止；maybe可能；can＇t一定不；could可能；must必须。根据“She...be a nurse”可知，第一空应用can＇t，表示“一定不是”。再结合“because I saw her in uniform in the hospital.”可知，第二空应用could，表示“可能是”。故选B。
9. - I've taken a white jacket by mistake, - It _____ be Gina's. She sometimes wears white.
A. must B. should C. need D. could
【答案】D
【详解】句意：-我拿错了一件白色的夹克。-她可能是吉娜的。她有时候穿白色衣服。
考查情态动词表推测。must一定；should应该；need需要；could可能。根据“She sometimes wears white”可知，吉娜有时候穿白色衣服，推测衣服可能是吉娜的。故选D。
10. Be careful with knives, or you ______cut your fingers.
A. must B.can C. may D. have to
【答案】C
【详解】句意：小心用刀，否则你会割伤手指的。
考查情态动词辨析。must 必须；can 能够；may可能；have to不得不。根据“cut your fingers”可知，此处表示微小的可能性，故用情态动词may。故选C。
11. -We can see some wild animals in the forest, right
-It's hard to say. There _____be only a few left.
A. may B. must C. need D. could
【答案】A
【详解】句意：-我们可以在森林里看到一些野生动物，对吗？-这很难说。可能只剩下几只了。
考查情态动词。may可能；must 必须；need需要；could能够。根据“It＇s hard to say”和“There...be only a few left”可知，此处表示不确定性，且可能性不大。故应是可能只剩下几只了。故选A。
12.--Daddy, I've signed for a big box by S.F. Express. What's in it
-I'm not sure. It_____ be a gift for you from your grandma.
A.may B. must C. should D. will
【答案】A
【详解】句意：-爸爸，我已经签收了顺丰快递的一个大箱子。里面是什么？-我不确定。这可能是你奶奶送给你的礼物。
考查情态动词。may可能；must必须；should应该；will将，会，要。根据“I＇m not sure.It...be a gift”可知， 爸爸不确定盒子里有什么，因此“可能”符合语境，是情态动词表推测的用法。故选A。
13. --What's the matter with Tom He has been absent for two days.
-He _____be ill. Let's go and ask Ms. White.
A. can B. need C. may D. would
【答案】C
【详解】句意：-汤姆怎么了？他已经缺席两天了。-他可能病了。我们去问问怀特女士吧。
考查情态动词。can能；need需要；may可能；would将。根据“Let＇s go and ask Ms.White”可知是可能生病了，所以去问问怀特女士。故选C。
14. Our new PE teacher ______be in his twenties. He looks so young, only a few years older than us.
A. may B. must C. can't D. shouldn't
【答案】A
【详解】句意：我们的新体育老师可能二十多岁。他看起来好年轻，只比我们大几岁。
考查情态动词。may可能；must一定；can＇t不可能；shouldn＇t不应该。根据“He looks so young，only a few years
older than us.”可知，此处表不确定的推测，表示可能二十多岁，用may表示。故选A。
15. --Where is Bob
--I'm not sure. He _____be on the playground.
A. must B. can't C.might
【答案】C
【详解】句意：-鲍勃在哪儿？-我不确定。他可能在操场上。
考查情态动词。must一定；can＇t不可能；might可能。根据“I＇m not sure.”可知不确定，说明鲍勃可能在操场上，故选C。
16.-What will the weather be like tomorrow
--I'm not sure. It ___ be rainy.
A.must B. might C. should
【答案】B
【详解】句意：-明天的天气怎么样？-我不确定。可能会下雨。
考查情态动词辨析。must必须；might可能；should应该。根据“T＇m not sure”可知，此处表示猜测某种可能性，应用might，故选B。
17. Ted _____go to the party with us tonight, but he hasn't decided yet.
A. must B. might C. ought D. will
【答案】B
【详解】句意：特德今晚可能和我们一起去参加聚会，但他还没有决定。
考查情态动词。must必须；might可能；ought应该；will将。根据“he hasn＇t decided yet”可知，还没决定是否去参加聚会，也就是可能会去。故选B。
18. I heard you laughing in the meeting room. You_____be very happy.
A. can B. should C. need D. must
【答案】D
【详解】句意：我听见你在会议室里笑。你一定很高兴吧。
考查情态动词辨析。can能；should应该；need需要；must必须，一定是。根据上文“I heard you laughing in the meeting room.”可知，听到笑声，由此推断对方一定很开心，用must表示可能性很大的肯定推测。故选D。
19.--Whose dictionary is this
-lt_______be Jeff"s. Look! His name is on Page One.
A. should B. can't C. need D. must
【答案】D
【详解】句意：-这是谁的词典？-一定是杰夫的。看！第一页上有他的名字。
考查情态动词辨析。should应该；can＇t不能；need需要；must一定是，必须。根据回答句“Look！His name is on Page One.”可知此处表示这本词典是杰夫的可能性很大，用must表示可能性大的肯定推测。故选D。
20.-You did well in the high jump, Tina. You_____have practiced a lot.
--Yeah. I trained hard at school for two months.
A. can B. could C. must D. might
【答案】C
【详解】句意：-你跳高跳得很好，蒂娜。你一定练了很多。-是的。我在学校刻苦训练了两个月。考查情态动词。can可能，表推断常用否定形式；could可能，表推断，不太肯定；must一定，；might可能。根据“You did well in the high jump”可知，是指一定练了很多，故选C。
21. -______Lily, is this suitcase yours
No, it isn't. It___ __ be Mary's. Look, there's her name on it.
A. must B. might C. mustn't D. can't
【答案】A
【详解】句意：-莉莉，这箱子是你的吗？-不，不是。一定是玛丽的。看，上面有她的名字。考查情态动词。must（表示很可能或符合逻辑）一定，肯定；might可能；mustn＇t不可以，禁止；can＇t不会，不能。根据“It...be Mary＇s.Look，there＇s her name on it.”可知此处表达的是箱子一定是玛丽的。故选A。
22. -Hi, Tom. Do you know where David is
--He _______be in the classroom, I saw him run into the classroom a minute ago.
A. must B. need C.can D. may
【答案】A
【详解】句意：-嗨，汤姆。你知道大卫在哪里吗？-他一定在教室里。我一分钟前看见他跑进教室。考查情态动词。must一定；need需要；can能；may可能。根据“I saw him run into the classroom a minute ago.”可知一分钟前看到他跑进了教室，所以他一定在教室里。故选A。
23. --Lily, is this handbag yours
--No. It ______be Lucy's. Look! There is her name on it.
A.can B. must C. should D. might
【答案】B
【详解】句意：-莉莉，这个手提包是你的吗？-不是。一定是露西的。看上面有她的名字。
考查情态动词。can能够；must一定；should应该；might可能。根据“There is her name on it”可知上面有她的名字，所以一定是她的。故选B。
24.-Look, Sarah, there's a red notebook on the desk. Whose is it
-It_______be Tom's as his notebook is blue. It be Lily's as her name is on the cover,
A. mustn't; must B. mustn't; can C. can't; must D. can't; may
【答案】C
【详解】句意：-看，Sarah，桌上有一个红色的笔记本。这是谁的？-不可能是汤姆的，因为他的笔记本是蓝色的。肯定是莉莉的，因为封面上有她的名字。
考查情态动词。mustn＇t禁止；must必须；can可能；can＇t不可能；may可能。根据“as his notebook is blue”可知，红色笔记本不可能是汤姆的，第一空can＇t符合句意；再者根据“as her name is on the cover”可知，笔记本封面上有莉莉的名字，因此肯定是莉莉的，must符合句意。故选C。
25. There _____ something wrong with my mobile phone. It can't work these days.
A. must be B. can't be C.may be D. mustn't be
【答案】A
【详解】句意：我的手机肯定有问题。这些天都不能正常使用了。
考查情态动词表推测。must be一定；can＇t be不可能；不能；may be可能；mustn＇t be不准，禁止。根据“It can＇t work these days.”可知这些天手机无法使用，那么“一定”是出问题了。故选A。
二、完成句子
26. 那个女孩不可能是我妹妹，她去北京了。
That girl _______my sister. She has gone to Beijing.
【答案】can＇t be
【详解】对比中英文，再根据“She has gone to Beijing.”可知，她已经去北京了，空处应为“不可能是”，can＇t be“不可能是”，情态动词后面加动词原形；can表示推测，意为“可能”，一般用于否定句和疑问句中。故填can't be。
27.他可能是为了锻炼正在跑步。
He _________ for exercise.
【答案】could be running
【详解】根据中文意思，空白处应填入表示“可能（为了锻炼）正在跑步”。情态动词could 后跟进行时表示对当下正在发生情况的推测，即could be doing意为“可能正在做......”，run意为“跑步”，应改为现在分词形式running。故填 could be running。
28.他看起来很担心。他可能要上学迟到了，
He looks worried. He_______ _______late for school.
【答案】may／might be
【详解】根据句式可知，是“主系表”结构，may／might“可能”，情态动词，后接动词原形；be late for“做某事迟到”，故填may／might；be。
29.那玩具卡车一定是简的弟弟的。
The toy truck______ ______to Jane's little brother.
【答案】 must belong
【详解】“一定”must，情态动词，表示肯定的推测，其后跟动词原形；“是......的”也就是“属于......的”，用动词短语 belong to sb，故填must；belong。
30. 一定有什么东西闯入我们社区的住户家中。
There _______ something visiting the homes in our neighborhood.
【答案】must be
【详解】根据“There...something visiting the homes in our neighborhood.”可知，there be表示“有”；must“一定”，表示肯定推测。故填must be。
三、句型转换
31. I'm sure you are hungry. I'll get something to eat for you.(改同义句)
I think you______ _______hungry. I'll get something to eat for you.
【答案】 must be
【详解】原句I＇m sure you are hungry．是肯定推测，可换用must be表达。根据句意结构，可知填（1）．must (2).be。
32. Maybe there is something strange in the sky.(改为同义句)
There ______something strange in the sky.
【答案】may be
【详解】句意：或许天空中有什么奇怪的东西。原句中maybe表示“或许”，在句中作状语，相当于maybe“或
许是，可能是”，放在句中主语后，may是情态动词，后接动词原形be，故填may be。
33. The weather must be very cold outside.(变为否定句)
The weather______ ______very cold outside.
【答案】 can't be
【详解】句意：外边天气一定很冷。考查肯定句变为否定句。原句为must表推测的肯定句，其否定句应为表否定推测，故应用can＇t表示否定推测。情态动词后要跟动词原形，故后跟be。故填can＇t；be。
34. The tall man must be Jim’s uncle.(完成反意疑问句)
The tall man must be Jim's uncle,______ _____
【答案】 isn't he
【详解】句意：那个高个子一定是吉姆的叔叔。在陈述句中，若must表示推测时，反意疑问句要根据must后的动词采用相应的形式。must后为be，且主语为the tall man，故填isn＇t he。
35. Someone is knocking at my door. It must be Tom.(合并为一句)
It______ be Tom ______at my door.
【答案】 must knocking
【详解】Someone is knocking at my door.It must be Tom.（合并为一句）根据must be sb doing sth 一定是某人在做某事；故填（1）．must （2）．knocking
[真题链接]
1.(2023·湖南益阳·统考中考真题)-Are those Jim's glasses
--They____be Jim's because he doesn't wear glasses.
A. can't B. mustn't C. needn't
【答案】A
【详解】句意：-那些是Jim的眼镜吗？-它们不可能是Jim的，因为他不戴眼镜。
考查情态动词辨析。can＇t不可能；mustn＇t禁止；needn＇t不必。根据“because he doesn＇t wear glasses”可知， 不戴眼镜所以不可能是他的，否定推测用can＇t，故选A。
2.(2020·甘肃·统考中考真题)You haven't eaten all day. You ___be very hungry.
A. couldn't be B. can't C. might D. must
考查情态动词表推测。couldn＇t be 不可能是；can＇t不可能；might可能；must一定。根据“You haven＇t eaten all day.”，可知应该是“一定很饿”，故选D。
3.(2023-四川甘孜·统考中考真题)--Is Tony coming to the book show this Sunday
-I'm not sure. He ___ not come.
A. may B. should C. must D. need
【答案】A
【详解】句意：-托尼这个星期天会来参加书展吗？-我不确定。他可能不会来。
考查情态动词。may可能；should应该；must一定；need需要。根据“I＇m not sure.”可知表示不确定的推测应用may。故选A。
4.(2022·辽宁锦州·统考中考真题)-Will plants grow on other planets
-That _______be true. It's really difficult to predict the future.
A. mustn't B. should C. needn't D. may
【答案】D
【详解】句意：-植物会在其他星球上生产吗？-那可能是真的。未来真的很难预测。
考查情态动词。mustn＇t不可以，表禁止；should应该，应当；needn＇t不需要；may可能，表推测。根据“It＇s really difficult to predict the future”可知，未来很难预测，因此推测可能是真的。故选D。
5.(2022-湖南益阳·统考中考真题)-Is it important to protect wild animals, Susan
--Yes. If we don't protect them, they_____die out one day.
A. need B. can't C. may
【答案】C
【详解】句意：-保护野生动物很重要吗，苏珊？-是的。如果我们不保护它们，它们有一天可能会灭绝。
考查情态动词。need需要；can＇t不能；may可能。根据“If we don＇t protect them，they...die out one day.”可知， 表示一种可能性，应用may，故选C。
6.(2017-湖南湘潭·统考中考真题)Andy _____ come to our reading club, but she hasn't decided yet.
A. may B. mustn't C.will
【答案】A
【详解】句意：安迪可能会来我们的阅读俱乐部，但她还没有决定。
考查情态动词，may可能；mustn＇t禁止；will将要。根据“but she hasn＇t decided yet.”，可知应该四可能，故选A。
7.(2020·江苏无锡·统考中考真题)You ______be able to control all the things that happen to you, but you can decide not to be reduced by them.
A. need not B. may not C. must not D. should not
【答案】B
【详解】句意：你可能无法控制发生在你身上的所有事情，但你可以决定不被它们拖累。
考查情态动词辨析。need not不需要；may not可能不；must not禁止，不能；should not不应该。根据句中“but you can decide not to be reduced by them”可知，此处使用may not，表示推测，意为“你可能无法控制发生在你身上的所有事情，但你可以决定不被它们拖累”。故选B。
8.(2023-湖北襄阳·统考中考真题)--Does the sports watch belong to Mary
--_____be hers. She is the only one who wears the sports watch in our class.
A. can't B. must C.might D. could
【答案】B
【详解】句意：-这块运动手表是玛丽的吗？-一定是她的。她是我们班唯一戴运动表的人。
考查情态动词。can＇t不可能；must一定；might可能；could能够。根据“She is the only one who wears the sports watch in our class.”可知玛丽是班里唯一戴运动表的人，所以这块运动手表一定是玛丽的，表达有把握的肯定推测用must。故选B。
9.(2023·辽宁盘锦·统考中考真题)Tina lost her pet dog. She ____ be worried about it.
A. need B. must C. can't D. shouldn't
【答案】B
【详解】句意：蒂娜丢了她的宠物狗。她一定很担心。
考查情态动词。need需要；must一定；can＇t不可能；shouldn＇t不应该。根据“Tina lost her pet dog”可知丢失了宠物狗，一定很担心，表示有把握的肯定推测应用must。故选B。
10.(2022-广西玉林·统考中考真题)--Hey, whose basketball do you think this is
--It ________belong to Linda. She likes playing basketball best in our class.
A. must B. can C. mustn't D. can't
【答案】A
【详解】句意：-嘿，你认为这是谁的篮球？-那一定属于Linda。她在我们班最喜欢打篮球。
考查情态动词辨析。must一定；can能够。mustn＇t禁止；can＇t不可能。根据“She likes playing basketball best in our class”可知，推测一定是Linda的，表十分肯定的推测用must，故选A。
11.(2022-黑龙江牡丹江·统考中考真题)--Angel, I have moved near People's Park.
-Oh, it ______ be very convenient. You can exercise there any time now.
A. must B. might C. could
【答案】A
【详解】句意：-安吉拉，我搬到人民公园附近了。-哦，那一定很方便。现在你随时都可以去那里锻炼。
考查动词辨析。must必须；might可能；could能。根据“it...be very convenient”可知，此处是非常肯定的推测，故选A。
12.(2022·内蒙古包头·统考中考真题)-You______be excited-you have tickets for your favourite band! --Yes. It's unbelievable that I can see the band play live!
A.need B. have to C. must D. might
【答案】C
【详解】句意：-你得到了你最爱的乐队的票，你一定很兴奋。-是的。我可以看到乐队的现场演奏会，真是难以置信。
考查情态动词。need 需要；have to不得不；must必须；might可能。根据“you have tickets for your favourite band”可知，句子表达肯定猜测“一定很兴奋”。故选C。
13.(2022-湖北鄂州·统考中考真题)-Whose is this toy truck
-It _____belong to Dick. He was the only little kid at the picnic.
A.can't B. must C. could D. need
【答案】B
【详解】句意：-这辆玩具卡车是谁的？-它一定是迪克的。他是野餐会上唯一的小孩。
考查情态动词。can＇t不能；must一定；could可能；need需要。根据“He was the only little kid at the picnic.”
可知迪克是野餐会上唯一的小孩，所以这个玩具卡车一定是他的，故选B。
14.(2022·天津·统考中考真题)The book____be Mary's. We can see her name on it.
A. need B. must C. can't D. needn't
【答案】B
【详解】句意：这本书一定是玛丽的。我们可以在上面看到她的名字。
考查情态动词辨析。need 需要；must一定；can＇t不可能；needn＇t不需要。根据“We can see her name on it”可知，此处表示肯定推测，故选B。
15. (2022-四川泸州·统考中考真题)-David, do you know Su Yiming, a snowboarder from China -Sure. He won the first place in the men's Big Air Event. He_____be hard-working.
A. needn't B. can't C. should D. must
【答案】D
【详解】句意：-大卫，你认识来自中国的单板滑雪运动员苏翊鸣吗？-当然。他在男子大跳台赛事中获得第一名。他一定很努力。
考查情态动词。needn＇t不必；can＇t不能；should应该；must一定。根据“He won the first place in the men＇s Big Air Event”可知他获得了第一名，所以此处作肯定推测，他一定很努力。故选D。
16.(2017-贵州六盘水-统考中考真题)The dictionary at the Lost and Found ___be Tim's, because his name is on its cover.
A. can B. mustn't C. can't D. must
【答案】D
【详解】句意：失物招领处的那本词典一定是蒂姆的，因为封面上有他的名字。
考查动词辨析。can可以；mustn＇t禁止；can＇t不可能；must必须，一定。根据“because his name is on its cover”可知，此处表示肯定推测，故选D。
17.(2023-山东菏泽·统考中考真题)-Where are you going this summer vacation
--______go to Zibo, but I'm not sure.
A. must B. needn't C. might
【答案】C
【详解】句意：-这个暑假你要去哪里？-我可能去淄博，但我不确定。
考查情态动词。must必须；needn＇t不需要；might可能。根据“but I＇m not sure.”可知，此处指可能去淄博，表一种可能的推测。故选C。
18.(2023-全国·九年级专题练习)-When Monday I'm afraid Monday_____be a problem for me.
-But why I know you are free on Monday.
A.need B. needn't C. might not D. might
【答案】D
【详解】句意：-什么时候？星期一？恐怕星期一对我来说可能是个问题。-但是为什么？我知道你星期一有空。考查情态动词。need需要；needn＇t不需要；might not可能不；might可能。根据“I＇m afraid Monday...be a problem for me.”可知，此处指恐怕星期一可能没空，故用might。故选D。
19.(2022-湖南怀化·统考中考真题)-Whose English book is this
-I______ be Lily's, but I'm not sure.
A. might B. can't C. must
【答案】A
【详解】句意：-这是谁的英语书？-可能是莉莉的，但我不确定。
考查情态动词。might可能；can＇t不可能；must一定；结合“but I＇m not sure.”可知，此处是一种不确定的推测，应用might，故选A。
20.(2021·四川资阳·统考中考真题)-Lucy, could you give me some suggestions on reading
-OK. My first suggestion is that you ______have a good reading habit.
A. will B. can C.might D. should
【答案】D
【详解】句意：-露西，你能不能给我一些阅读上的建议？-好的。我的第一个建议是你应该有一个良好的阅读习惯。
考查情态动词辨析。will将会；can能、会；might可能；should应该。根据主语“My first suggestion”可知，应是你应该有良好的阅读习惯，表示对别人提出建议。故选D。
21.(2023-全国·九年级专题练习)--Is that Jim running on the playground
--It ____be him. He is always in the library at this time.
A, mustn't B. shouldn't C. can't D. needn't
【答案】C
【详解】句意：-在操场上跑步的是吉姆吗？-不可能是他。这个时候他总是在图书馆。
考查动词辨析。mustn＇t禁止；shouldn＇t不应该；can＇t不可能；needn＇t不需要。根据“It...be him.He is always in the library at this time.”可知，吉姆这个时候都在图书馆，所以不可能在操场跑步，故选C。
22.(2017-四川眉山·统考中考真题)Mr. Smith_____be at home. He has gone to Hong Kong.
A. can B. can't C. must D. mustn't
【答案】B
【详解】句意：史密斯先生不可能在家。他去香港了。
考查情态动词辨析。can能够；can＇t不可能；must 必须；mustn＇t禁止。根据“He has gone to Hong Kong”可知，去了香港所以不可能在家，表否定推测用can’t，故选B。
23.(2017-辽宁鞍山·统考中考真题)--Do you think that Yao Ming will be elected(选举) as the MVP this year --It_______ him. He has retired(退役) for several years.
A. can't be B. mustn't be C. can be D. must be
【答案】A
【详解】句意：-你认为姚明会被选为今年最优秀的球员吗？-不可能是他。他已经退役几年了。
考查情态动词。can＇t不可能，表示有把握的否定推测；mustn＇t禁止；must一定，表示有把握的肯定推测；can 能够，表示能力。根据“He has retired（退役）for several years.”可知，此处有依据证明姚明不可能被选为最优秀的球员。否定推测用can＇t，故选A。
24.(2022·云南玉溪·统考一模)-Oh, my God! I'll nearly lose my heart.
--Cheer up. Life ______ be perfect all the time.
A, can't B. mustn't C. needn't D. shouldn't
【答案】A
【详解】句意：-哦，我的上帝！我几乎要失去信心了。-振作起来。生活不可能总是完美的。考查动词辨析。can＇t不可能；mustn＇t禁止；needn＇t不必；shouldn＇t不应该。根据“Life...be perfect all the time.”可知，此处是指生活不可能总是完美的，表示否定推测用can＇t。故选A。
25.(2021-辽宁·统考中考真题)Sit down, please. You _____ be tired after standing for so long.
A. could B. can C. must D.might
【答案】C
【详解】句意：请坐。站了这么久，你一定累了。
考查情态动词表推测。could可能；can可能；must一定；might也许。根据“after standing for so long”可知，这里指一定累了，故选C。
26.(2021-新疆·统考中考真题)-I saw Mr. Li in his office just now,
-No, it ___be him. He has___Guangzhou and will be back in two days.
A. mustn't; gone to B. mustn't; been to
C. can't: been to D. can't: gone to
【答案】D
【详解】句意：-我刚才看见李先生在他的办公室里。-不，不可能是他。他去了广州，两天后回来。考查情态动词和现在完成时。mustn＇t禁止；can＇t不可能；have been to意为“曾经去过某地”，表示现在已不在那里了；have gone to 意为“已经去了某地”，说话时此人还没回来。根据下文“He has gone to Guangzhou”可知，此处表否定推测，A、B选项可排除。根据下文“will be back in two days”可知，李先生还在广州没有回来，故第二空应用gone to。故选D。
27.(2020-天津·统考中考真题)I_____ be late, so don't wait for me to start the meeting.
A. mustn't B. needn't C. need D. may
【答案】D
【详解】句意：我可能要迟到了，因此开始开会吧，不要等我。
考查情态动词。mustn＇t禁止；needn＇t没必要；need需要；may可能。根据“so don＇t wait for me to start the meeting”可知此处表示不确定推测，用may表示“可能”。故选D。
28.(2020·江苏连云港·统考中考真题)If we don't protect nature, some wildlife die out in the future.
A. need B. may C. can't D. shouldn't
【答案】B
【详解】句意：如果我们不保护自然，一些野生动物将来可能会灭绝。
考查情态动词。need需要；may可能；can＇t可能不，一定不；shouldn＇t不应该。根据句意可知，空处表示肯定推测；结合选项可知，选项里表肯定推测的情态动词只有may，可能会灭绝may die out符合语境。故选B。
29.(2020·四川广元·统考中考真题)There____something wrong with my mobile phone. It can't work these days.
A. must be B. can't be C.may be
【答案】A
【详解】句意：我的手机肯定有问题。这些天都不能正常使用了。
考查情态动词表推测。must be 一定；can＇t be 不可能；不能；may be 可能。根据It can＇t work these days.可知这些天手机无法使用，那么“一定”是出问题了。故选A。
30.(2020-黑龙江·统考中考真题)--Where is Monica I can't find her anywhere.
-She _______be in the library. She loves reading books when she is free.
A.can B. must C. can't
【答案】B
【详解】句意：-莫妮卡在哪里？我到处都找不到她。-她一定在图书馆。她有空的时候喜欢读书。考查情态动词。can可能，常用于一般疑问句或否定句；must肯定、一定；can＇t不可能。根据“She loves reading books when she is free.”可知她有空的时候喜欢读书，句子是肯定句，此处是有把握的肯定猜测，用“must”。
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https://www.21cnjy.com/help/help_extract.php/ 让教学更有效 英语学科
Unit 8 It must belong to Carla．
语法讲练
【知识导图】
【要点拓展】
1．表示肯定的猜测时，must可能性最大，can／could次之，may／might最小。
2．表示否定的猜测时can’t／couldn’t语气最强，指“不可能”；may not／might not语气最弱，指“可能不”。
3．在反意疑问句中，当谓语动词含有must／might／can等表推测意义时，疑问部分的助动词应与情态动词后面的动词在非推测情况下的用法保持一致。
She must be a driver，isn’t she？她一定是个司机，是吗？
It must have rained last night，didn’t it？昨晚一定下雨了，是不是？
4．在特定语境中，一些“情态动词＋have done”具有一定感彩。
（1）ought to／should have done本该做，却未做；oughtn’t to／shouldn’t have done 本不该做，却做了（含责备之意）
例：You shouldn’t have done that，I had warned you of that several times.我已多次警告你，你本不该那么做的。
（2）might have done本可以做，却没做（表很委婉的责备）
例：You might have phoned me，though you were busy then.你再忙也该给我打个电话。
（3）could have done本可能，却没有
例：He could have caught the early bus， but he was delayed by helping a stranger.他本能够赶上早班车，但因为帮一个陌生人而晚点。
（4）would（not）have done 本想做，却没做／本不想做，却做了
例：I would have helped you，but I was too busy.我本想帮你，可我太忙了。
【奇思巧计】
【同步检测】
一、单项选择
1. -Whose jeans are these
-They______be John's. They are much larger than his.
A. might B. must C. can't
2. -I think Mr Zhang may be in his office.
-No, he ______ be there. I saw him_______just now.
A. needn't; left B. mustn't; leaving C. can't; leave D. shouldn't; left
3. -Sam, go to open the door, please. It______be your sister.
-No, Dad. It ____be her. She will be back after four o'clock.
A. May; mustn't B. must; can't C.must; mustn't
4. David ______ be at home, for no one answers the phone.
A. must B. mustn't C. can D. can't
5. It______be Lingling's book, but I'm not sure. Liu Hui likes reading, too.
A. can't B. must C. could
6. --There is someone knocking on the door. I wonder who it ______ be.
-It_______be Frank. He phoned to tell me he would come to our home soon.
A. must; mustn’t B. could; must C.might; can't D. might; mustn't
7. -Where is Linda
- I'm not sure. She ______ in the school library.
A. could be B. must be C. can't be D. will be
8.-Maybe she is a teacher.
--No, she ______be. She _______be a nurse because I saw her in uniform in the hospital.
A. mustn't, maybe B. can't, could C. mustn't, must
9. - I've taken a white jacket by mistake, - It _____ be Gina's. She sometimes wears white.
A. must B. should C. need D. could
10. Be careful with knives, or you ______cut your fingers.
A. must B.can C. may D. have to
11. -We can see some wild animals in the forest, right
-It's hard to say. There _____be only a few left.
A. may B. must C. need D. could
12.--Daddy, I've signed for a big box by S.F. Express. What's in it
-I'm not sure. It_____ be a gift for you from your grandma.
may B. must C. should D. will
13. --What's the matter with Tom He has been absent for two days.
-He _____be ill. Let's go and ask Ms. White.
A. can B. need C. may D. would
14. Our new PE teacher ______be in his twenties. He looks so young, only a few years older than us.
A. may B. must C. can't D. shouldn't
15. --Where is Bob
--I'm not sure. He _____be on the playground.
A. must B. can't C.might
16.-What will the weather be like tomorrow
--I'm not sure. It ___ be rainy.
must B. might C. should
17. Ted _____go to the party with us tonight, but he hasn't decided yet.
A. must B. might C. ought D. will
18. I heard you laughing in the meeting room. You_____be very happy.
A. can B. should C. need D. must
19.--Whose dictionary is this
-lt_______be Jeff"s. Look! His name is on Page One.
A. should B. can't C. need D. must
20.-You did well in the high jump, Tina. You_____have practiced a lot.
--Yeah. I trained hard at school for two months.
A. can B. could C. must D. might
21. -______Lily, is this suitcase yours
No, it isn't. It___ __ be Mary's. Look, there's her name on it.
A. must B. might C. mustn't D. can't
22. -Hi, Tom. Do you know where David is
--He _______be in the classroom, I saw him run into the classroom a minute ago.
A. must B. need C.can D. may
23. --Lily, is this handbag yours
--No. It ______be Lucy's. Look! There is her name on it.
can B. must C. should D. might
24.-Look, Sarah, there's a red notebook on the desk. Whose is it
-It_______be Tom's as his notebook is blue. It be Lily's as her name is on the cover,
A. mustn't; must B. mustn't; can C. can't; must D. can't; may
25. There _____ something wrong with my mobile phone. It can't work these days.
A. must be B. can't be C.may be D. mustn't be
二、完成句子
26. 那个女孩不可能是我妹妹，她去北京了。
That girl _______my sister. She has gone to Beijing.
他可能是为了锻炼正在跑步。
He _________ for exercise.
他看起来很担心。他可能要上学迟到了，
He looks worried. He_______ _______late for school.
29.那玩具卡车一定是简的弟弟的。
The toy truck______ ______to Jane's little brother.
30. 一定有什么东西闯入我们社区的住户家中。
There _______ something visiting the homes in our neighborhood.
三、句型转换
31. I'm sure you are hungry. I'll get something to eat for you.(改同义句)
I think you______ _______hungry. I'll get something to eat for you.
32. Maybe there is something strange in the sky.(改为同义句)
There ______something strange in the sky.
33. The weather must be very cold outside.(变为否定句)
The weather______ ______very cold outside.
34. The tall man must be Jim’s uncle.(完成反意疑问句)
The tall man must be Jim's uncle,______ _____
35. Someone is knocking at my door. It must be Tom.(合并为一句)
It______ be Tom ______at my door.
[真题链接]
1.(2023·湖南益阳·统考中考真题)-Are those Jim's glasses
--They____be Jim's because he doesn't wear glasses.
A. can't B. mustn't C. needn't
2.(2020·甘肃·统考中考真题)You haven't eaten all day. You ___be very hungry.
A. couldn't be B. can't C. might D. must
3.(2023-四川甘孜·统考中考真题)--Is Tony coming to the book show this Sunday
-I'm not sure. He ___ not come.
A. may B. should C. must D. need
4.(2022·辽宁锦州·统考中考真题)-Will plants grow on other planets
-That _______be true. It's really difficult to predict the future.
A. mustn't B. should C. needn't D. may
5.(2022-湖南益阳·统考中考真题)-Is it important to protect wild animals, Susan
--Yes. If we don't protect them, they_____die out one day.
A. need B. can't C. may
6.(2017-湖南湘潭·统考中考真题)Andy _____ come to our reading club, but she hasn't decided yet.
A. may B. mustn't C.will
7.(2020·江苏无锡·统考中考真题)You ______be able to control all the things that happen to you, but you can decide not to be reduced by them.
A. need not B. may not C. must not D. should not
8.(2023-湖北襄阳·统考中考真题)--Does the sports watch belong to Mary
--_____be hers. She is the only one who wears the sports watch in our class.
A. can't B. must C.might D. could
9.(2023·辽宁盘锦·统考中考真题)Tina lost her pet dog. She ____ be worried about it.
A. need B. must C. can't D. shouldn't
10.(2022-广西玉林·统考中考真题)--Hey, whose basketball do you think this is
--It ________belong to Linda. She likes playing basketball best in our class.
A. must B. can C. mustn't D. can't
11.(2022-黑龙江牡丹江·统考中考真题)--Angel, I have moved near People's Park.
-Oh, it ______ be very convenient. You can exercise there any time now.
A. must B. might C. could
12.(2022·内蒙古包头·统考中考真题)-You______be excited-you have tickets for your favourite band! --Yes. It's unbelievable that I can see the band play live!
A.need B. have to C. must D. might
13.(2022-湖北鄂州·统考中考真题)-Whose is this toy truck
-It _____belong to Dick. He was the only little kid at the picnic.
can't B. must C. could D. need
(2022·天津·统考中考真题)The book____be Mary's. We can see her name on it.
A. need B. must C. can't D. needn't
15. (2022-四川泸州·统考中考真题)-David, do you know Su Yiming, a snowboarder from China -Sure. He won the first place in the men's Big Air Event. He_____be hard-working.
A. needn't B. can't C. should D. must
16.(2017-贵州六盘水-统考中考真题)The dictionary at the Lost and Found ___be Tim's, because his name is on its cover.
A. can B. mustn't C. can't D. must
17.(2023-山东菏泽·统考中考真题)-Where are you going this summer vacation
--______go to Zibo, but I'm not sure.
A. must B. needn't C. might
18.(2023-全国·九年级专题练习)-When Monday I'm afraid Monday_____be a problem for me.
-But why I know you are free on Monday.
A.need B. needn't C. might not D. might
19.(2022-湖南怀化·统考中考真题)-Whose English book is this
-I______ be Lily's, but I'm not sure.
A. might B. can't C. must
20.(2021·四川资阳·统考中考真题)-Lucy, could you give me some suggestions on reading
-OK. My first suggestion is that you ______have a good reading habit.
A. will B. can C.might D. should
21.(2023-全国·九年级专题练习)--Is that Jim running on the playground
--It ____be him. He is always in the library at this time.
A, mustn't B. shouldn't C. can't D. needn't
(2017-四川眉山·统考中考真题)Mr. Smith_____be at home. He has gone to Hong Kong.
A. can B. can't C. must D. mustn't
23.(2017-辽宁鞍山·统考中考真题)--Do you think that Yao Ming will be elected(选举) as the MVP this year --It_______ him. He has retired(退役) for several years.
A. can't be B. mustn't be C. can be D. must be
24.(2022·云南玉溪·统考一模)-Oh, my God! I'll nearly lose my heart.
--Cheer up. Life ______ be perfect all the time.
A, can't B. mustn't C. needn't D. shouldn't
(2021-辽宁·统考中考真题)Sit down, please. You _____ be tired after standing for so long.
A. could B. can C. must D.might
26.(2021-新疆·统考中考真题)-I saw Mr. Li in his office just now,
-No, it ___be him. He has___Guangzhou and will be back in two days.
A. mustn't; gone to B. mustn't; been to
C. can't: been to D. can't: gone to
27.(2020-天津·统考中考真题)I_____ be late, so don't wait for me to start the meeting.
A. mustn't B. needn't C. need D. may
28.(2020·江苏连云港·统考中考真题)If we don't protect nature, some wildlife die out in the future.
A. need B. may C. can't D. shouldn't
29.(2020·四川广元·统考中考真题)There____something wrong with my mobile phone. It can't work these days.
A. must be B. can't be C.may be
30.(2020-黑龙江·统考中考真题)--Where is Monica I can't find her anywhere.
-She _______be in the library. She loves reading books when she is free.
can B. must C. can't
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