资源简介

语法一日一练
（26年外研新版八年级下册英语）
Unit 1 被动语态（1）：一般现在时和一般将来时的被动语态
Unit 3 情态动词（1）：should/must/can/need/have to与had better
Unit 4 情态动词（2）：表示“可能性与推测”的常用情态动词
Unit 5 宾语从句（1）：从属连词that、whether/if
Unit 6 宾语从句（2）：疑问词引导的宾语从句
Unit4情态动词（2） Day1
第一部分 单项选择
1. The light in her room is off. She _______ be at home now — she told me she would go shopping this evening. A. must B. can’t C. may D. should 2. — Is Lucy coming to the party — She______ come, but she hasn’t confirmed yet. Her mom might ask her to do homework. A. must B. can’t C. might D. should 3. You ______ finish the task today if you hurry up — the deadline is tomorrow morning, not tonight. A. needn’t B. mustn’t C. should D. can’t 4. The door is locked. Dad______ be in the study, because he never locks the door when he’s inside. A. must B. can’t C. may D. might 5. — Who left the window open — It _______ be Tom. He often forgets to close windows when he leaves. A. must B. can’t C. may not D. shouldn’t 6. She has practiced the piano for 5 years. She_______ play it very well now. A. might B. can’t C. should D. may not 7. The letter_______ be from my pen pal. There’s no stamp on it, and she always sends letters with stamps. A. must B. can’t C. may D. should 8. — I can’t find my math book. — It_______ be in your schoolbag. You put it there this morning before class. A. must B. might not C. can’t D. may not 9. It’s going to rain. You _______ take an umbrella with you, or you’ll get wet. A. mustn’t B. should C. can’t D. may 10. He knows nothing about the plan, so he_______ give you any useful advice. A. must B. should C. can’t D. may
第二部分 翻译句子 地上都是雪，昨晚一定下得很大。（must） 他还没来，可能是路上堵车了。（may） 这个书包不可能是莉莉的，她的书包是粉色的。（can’t） 你应该早点睡觉，明天还要早起呢。（should） 5. 他也许知道答案，但我不确定。（might）
答案解析 一、单项选择
1. B，解析：灯关了+说过要去购物，表“不可能在家”，用can’t表强否定推测。 2. C，解析：没确认+可能被要求写作业，表“不确定的可能”，用might。 3. A，解析：截止时间在明天，表“不必今天完成”，needn’t表不必，符合语境。 4. B，解析：爸爸在书房从不锁门，现在门锁了，表“不可能在书房”，用can’t。 5. A，解析：汤姆常忘关窗，表“肯定是他”，must表强肯定推测。 6. C，解析：练琴5年，表“按常理应该弹得好”，should表理应如此的推测。 7. B，解析：笔友寄信必贴邮票，现在没邮票，表“不可能是她寄的”，用can’t。 8. A，解析：早上放书包里了，表“肯定在书包里”，must表强肯定推测。 9. B，解析：要下雨了，表“建议带伞”，should表理应做的建议性推测。 10. C，解析：对计划一无所知，表“不可能给有用建议”，用can’t。
二、翻译句子
1. There is snow everywhere on the ground. It must have snowed heavily last night. 解析：must+have done表对过去事情的肯定推测，符合“昨晚下雪”的语境。 2. He hasn’t come yet. He may be stuck in traffic on the way. 解析：may+动词原形表对现在情况的不确定推测，“be stuck in traffic”表堵车。 3. This schoolbag can’t be Lily’s. Hers is pink. 解析：can’t表强否定推测，“Lily’s”用名词所有格表“莉莉的书包”，符合题意。 4. You should go to bed early. You have to get up early tomorrow. 解析：should表建议性推测，后接动词原形，衔接“明天早起”的语境合理。 5. He might know the answer, but I’m not sure. 解析：might表可能性更低的推测，呼应后半句“不确定”，语气匹配。
Unit4情态动词（2）
Day2 第一部分 单项选择 1. — Mom, I can’t find my keys. — They _______ be on the sofa. You often put your small things there. A. can’t B. must C. may not D. shouldn’t 2. The movie starts in 10 minutes. We _______ hurry, or we’ll miss the beginning. A. should B. can’t C. mustn’t D. may 3. He never smokes, so the cigarette end on the desk_______be his. A. must B. can’t C. may D. should 4. — Will Mr. Li come to our class meeting — He_______ come, but he has a meeting at the same time, so it’s hard to say. A. must B. can’t C. might D. should 5. You_______ worry about your grandma. The doctor said she will get well soon. A. needn’t B. must C. should D. can’t 6. The baby is crying. She_______ be hungry or sleepy — those are her two usual reasons for crying. A. must B. can’t C. may D. may not 7. This book _______ belong to Jack. His name is written on the first page. A. can’t B. must C. might D. should 8. It’s too late. The shop _______be open now — it usually closes at 9 p.m. A. must B. should C. can’t D. may 9. You_______cross the road when the light is red. It’s very dangerous. A. mustn’t B. should C. may D. can 10. She studies very hard every day. She _______ get good grades in the final exam. A. might not B. can’t C. should D. may not
第二部分 翻译句子
1. 他整天都在图书馆，一定是在为考试做准备。（must） 外面天黑了，可能已经七点多了。（may） 他不可能撒谎，他一直是个诚实的孩子。（can’t） 你应该多锻炼，这对你的健康有好处。（should） 5. 她也许会参加这次比赛，但还没做决定。（might）
答案解析
一、单项选择 1. B，解析：常把小物件放沙发，表“肯定在沙发上”，must表强肯定推测。 2. A，解析：电影10分钟后开场，表“应该快点”，should建议性推测，避免错过开头。 3. B，解析：从不抽烟，表“烟头不可能是他的”，can’t表强否定推测。 4. C，解析：同时有会议、不确定能否来，表“可能性低的推测”，用might。 5. A，解析：医生说奶奶会痊愈，表“不必担心”，needn’t表不必，符合语境。 6. C，解析：宝宝哭通常是饿或困，表“不确定是哪种原因”，may表可能性推测。 7. B，解析：首页有杰克名字，表“肯定是他的书”，must表强肯定推测。 8. C，解析：通常9点关门，现在很晚了，表“不可能开门”，用can’t。 9. A，解析：红灯过马路危险，表“禁止、绝对不能”，mustn’t表禁止，符合规则。 10. C，解析：每天努力学习，表“按常理应该考好”，should表理应如此的推测。 二、翻译句子
1. He has been in the library all day. He must be preparing for the exam. 解析：must+be doing表对现在正在进行的动作的肯定推测，贴合“在备考”的语境。 2. It’s dark outside. It may be past seven o’clock. 解析：may表不确定推测，“past seven o’clock”表“七点多”，表达准确。 3. He can’t tell lies. He has always been an honest child. 解析：can’t表强否定推测，“has always been”表“一直是”，呼应“诚实”的属性。 4. You should exercise more. It’s good for your health. 解析：should表建议性推测，后接动词原形，衔接“对健康有益”，逻辑通顺。 5. She might take part in this competition, but she hasn’t made a decision yet. 解析：might表可能性低的推测，“take part in”表“参加”，匹配“未做决定”的语境。
Unit4情态动词（2）
Day3 第一部分 单项选择
1. The crayons ______ carry viruses and spread diseases. That’s why they can only be used once. A. must B. can C. may D. should 2. It ______ be boring to wait for X-rays and treatments. I want them to feel good. A. can B. must C. may D. need 3. There ______ be something for me to do to help the young patients. A. must B. can C. may D. should 4. It ______ sound impossible, but Leah didn’t give up. A. can B. must C. may D. should 5. —Is that Leah singing in the hospital garden —It ______ be her. She is raising money for crayons in the hall now. A. mustn’t B. can’t C. may not D. shouldn’t 6. Leah’s story went public. So far she ______ have collected a lot of crayon boxes. A. must B. can C. may D. should 7. The waiting rooms are now filled with happier kids and brighter pictures. The crayons ______ have made a big difference. A. can B. must C. may D. should 8. A pair of strong hands reached out to me—I ______ have been saved by a soldier. A. can B. must C. may D. should 9.The flowers in the vase are fresh. Someone ______ have bought them this morning. A. must B. can C. may not D. can’t 10. Love leads to love, and so it ______ create a circle of goodwill and kindness. A. can B. must C. may D. should 翻译句子
1. 蜡笔可能携带病毒并传播疾病。 等待X光检查和治疗可能会很无聊。 我一定能做点什么来帮助这些小病人。 这听起来可能不太可能，但莉娅没有放弃。 5. 现在候诊室里都是更开心的孩子和更明亮的画，这些蜡笔肯定起了很大作用。
答案解析
一、单项选择 1. C，解析：may表“可能”，符合课文原句中对蜡笔携带病毒的推测 2. A，解析：can表“可能会”，描述一种客观存在的可能性 3. A，解析：must表“一定”，表达强烈的决心和肯定推测 4. C，解析：may表“可能”，指这件事听起来“可能”不太可信 5. B，解析：can’t表“不可能”，与后文“她现在在大厅筹款”的事实矛盾 6. A，解析：must表“肯定”，根据“故事公开”的背景，推测她“肯定”收集了很多蜡笔 7. B，解析：must表“肯定”，根据候诊室的变化，推测蜡笔“肯定”起了作用 8. C，解析：may表“可能”，对救自己的人身份的不确定推测 9. A，解析：花很新鲜，高度肯定推测是今早买的，用must have done表过去肯定 10. A，解析：can表“能够，可以”，指爱“能够”创造善意的循环
二、翻译句子 1. Crayons may carry viruses and spread diseases. 2. It can be boring to wait for X-rays and treatments. 3. There must be something for me to do to help the young patients. 4. It may sound impossible, but Leah didn’t give up. 5. The waiting rooms are now filled with happier kids and brighter pictures. The crayons must have made a big difference.
Unit4情态动词（2）
Day4 第一部分 单项选择
1. The letter has her handwriting on it. It ______ belong to her. A. can’t B. must C. may D. should not 2. He didn’t reply to the message. He ______ have been reading in the study and didn’t hear it. A. must B. can C. may not D. can’t 3. The classroom is full of painting tools. The students ______ be having an art lesson now. A. may B. can C. must D. might not 4. She knows the story very well. She ______ have read the book many times. A. can’t B. must C. may D. should 5. —Is that Lucy giving a speech in the hall —It ______ be her. She is preparing for the exam in the classroom now. A. must B. can C. can’t D. may 6. The milk is a little cold. It ______ have been left on the table for an hour. A. must B. can C. may not D. can’t 7. He has a prize in his hand. He ______ have won the English competition easily. A. can’t B. must C. may D. should not 8. The light was off when I passed her room. She ______ be sleeping, or she ______ have gone out for a walk. A. must; might B. can; must C. might; can’t D. can’t; may 9. This book is about traditional culture. It ______ be Li Ming’s—he’s always interested in it. A. can’t B. may C. must D. should 10. She didn’t take her coat this morning, but it’s windy now. She ______ be feeling cold outside. A. can’t B. must C. may D. should not 第二部分 翻译句子
1. 他桌上放着足球，肯定要去参加足球训练。 2. 她戴着耳机，可能没听见你叫她。 3. 那不可能是我们的教室，我们的教室在三楼。 4. 黑板上还有板书，老师肯定刚离开教室。 5. 他带着相机，可能要去公园拍照。
答案解析
一、单项选择 1. B，解析：有她的笔迹，高度肯定推测，用must 2. A，解析：没回消息，结合“在书房看书”的语境，肯定推测没听见，用must 3. C，解析：满是绘画工具，高度肯定在上美术课，用must 4. B，解析：对故事很熟悉，肯定推测读了很多遍，用must have done表过去推测 5. C，解析：在教室备考，与“在大厅演讲”矛盾，否定推测，用can’t 6. A，解析：牛奶凉了，肯定推测在桌上放了一小时，用must 7. B，解析：拿奖品，肯定推测赢了比赛，用must 8. A，解析：灯灭了高度肯定在睡觉，用must；“出门散步”是不确定推测，用might 9. C，解析：他对传统文化感兴趣，高度肯定是他的书，用must 10. B，解析：没带外套又刮风，肯定推测觉得冷，用must 二、翻译句子 1. There is a football on his desk. He must be going to take part in the football training. 2. She is wearing earphones. She might not hear you call her. 3. That can’t be our classroom. Ours is on the third floor. 4. There is still writing on the blackboard. The teacher must have just left the classroom. 5. He is taking a camera. He might go to the park to take photos.
Unit4情态动词（2）
Day5 单项选择 1. The door is open, but there is no one in the room. They ______ have just gone out for a walk. A. must B. can C. may not D. can’t 2. —Is that Mr. Zhang riding a bike to work —It ______ be him. He always drives a car to work. A. mustn’t B. can’t C. may not D. shouldn’t 3. She didn’t practice the piano at all, so she ______ play the song well at the concert. A. mustn’t B. can’t C. may not D. shouldn’t 4. —______ the news be true We can’t believe our ears. —It ______ be true. Our head teacher told us just now. A. Can; must B. May; can’t C. Must; might D. Could; may not 5. He studied hard for the exam, so he ______ get a good grade. A. must B. should C. can’t D. might not 6. The window is broken. Someone ______ have broken it when we were not at home. A. must B. can C. may not D. can’t 7. She knows the city very well. She ______ have lived there for many years. A. might B. must C. can’t D. shouldn’t 8. It’s only 7 a.m. The shop ______ be open yet—it usually opens at 8 a.m. A. must B. should C. can’t D. might 9. —Where is my dictionary —It ______ be on your desk. You always put it there after using it. A. must B. can C. might D. can’t 10. They prepared a lot of food for the party, so the guests ______ be hungry. A. mustn’t B. can’t C. may not D. shouldn’t
第二部分 翻译句子 他考试前熬夜复习了，肯定考得不错。 会议室的灯关了，会议可能已经结束了。 他不可能认识她，两人来自不同的城市，从没见过面。 公交向来很准点，应该还有五分钟就到了。 5. 地上有脚印，一定有人进过这个房间。
答案解析
一、单项选择 1. A，解析：门开却没人，高度肯定“一定刚出去散步”，must have done表对过去的肯定推测 2. B，解析：总开车上班，否定推测“不可能是他”，用can’t 3. B，解析：完全没练琴，否定推测“不可能弹好”，用can’t；mustn’t表禁止 4. A，解析：疑问句表推测用can；班主任告知，高度肯定“一定是真的”，用must 5. B，解析：努力备考，情理推测“应该能取得好成绩”，用should 6. A，解析：窗户碎了，高度肯定“一定有人趁外出打碎了”，must have done表过去肯定推测 7. B，解析：对城市很熟悉，高度肯定“一定在那住了很多年”，用must 8. C，解析：通常8点开门，现在才7点，否定推测“不可能开门”，用can’t 9. A，解析：总用完放桌上，高度肯定“一定在桌上”，用must 10. B，解析：准备了很多食物，否定推测“客人不可能饿”，用can’t
二、翻译句子
1. He stayed up late to review before the exam. He must have got a good grade. 2. The light of the meeting room is off. The meeting might have ended already. 3. He can’t know her. They are from different cities and have never met each other. 4. The bus is always on time. It should arrive in five minutes. 5. There are footprints on the ground. Someone must have entered this room.
Unit4情态动词（2） Day6 第一部分 单项选择
1. —Is that Linda speaking —No, it ______ be her. She has gone to Beijing for a trip. A. mustn’t B. can’t C. may not D. shouldn’t 2. The light in the teacher’s office is still on. Mr. Li ______ be working there now. A. must B. can C. need D. can’t 3. —Who is knocking at the door —It ______ be my neighbor. He often comes to borrow something at this time. A. must B. can C. might D. can’t 4. The road is all covered with thick snow. It ______ be very cold outside. A. should B. can C. must D. might 5. —______ this pen be Jim’s His name is on the cap. —Of course it ______. A. Can; must B. May; can C. Must; might D. Could; can’t 6. She has never been to Japan, so she ______ speak Japanese fluently. A. mustn’t B. can’t C. may not D. shouldn’t 7. The film tickets are all sold out. The movie ______ be very popular among teenagers. A. should B. can C. might D. can’t 8. He left home an hour ago, so he ______ get to the station on time. The train leaves in two hours. A. mustn't B. should C. can’t D. might not 9. —Why didn’t he answer the phone —He ______ be sleeping. He always takes a nap at noon. A. must B. can C. may not D. can’t 10. It’s already 9 p.m. His parents ______ be back home soon—they usually finish work at this time. A. must B. can C. should D. might not 第二部分 翻译句子 1. 他书包还在教室，肯定没离开学校。 2. 杯子碎在了地上，可能是小猫碰倒的。 3. 那不可能是他的书包，他的书包上有贴纸。 4. 她提前复习了所有知识点，应该能通过这次考试。 5. 没人回应门铃，这家人可能外出了。
答案解析
一、单项选择
1. B，解析：去北京未回，否定推测“不可能是她”，用can’t；mustn’t表禁止 2. A，解析：办公室灯亮，高度肯定“一定在工作”，用must 3. A，解析：邻居常此时来借东西，肯定推测“一定是他”，用must 4. C，解析：路面积厚雪，高度肯定“外面一定很冷”，用must 5. A，解析：疑问句表推测用can；笔帽有名字，高度肯定“一定是他的”，用must 6. B，解析：从没去过日本，否定推测“不可能说流利日语”，用can’t 7. A，解析：票售罄，情理推测“应该很受欢迎”，用should 8. B，解析：一小时前出门，火车两小时后开，情理推测“应该能按时到”，用should 9. A，解析：总在中午午睡，高度肯定“一定在睡觉”，用must 10. C，解析：通常此时下班，情理推测“应该很快回家”，用should
二、翻译句子 1. His schoolbag is still in the classroom. He can’t have left the school. 2. The cup is broken on the ground. It might have been knocked over by the little cat. 3. That can’t be his schoolbag. There is a cartoon sticker on his. 4. She reviewed all the knowledge points in advance. She should pass this exam. 5. Nobody answers the doorbell. The family might have gone out.
Unit4情态动词（2）
Day7 第一部分 单项选择 1. He ________ gone abroad. I saw him in the office just now. A. may have B. can’t have C. must have D. should have 2. — Why didn’t you answer my call — I ________ been sleeping. I didn’t hear the ring at all. A. need have B. must have C. can have D. should have 3. The door was locked when we got here. They ________ left home already. A. must have B. may not C. can’t have D. should 4. She looks upset. She ________ failed the English exam, but I’m not sure. A. may have B. must C. can have D. should have 5. You ________ told him the truth earlier. Now he is so angry with us. A. may have B. can’t have C. must have D. should have 6. The ground is all wet. It ________ rained heavily last night. A. must have B. can’t have C. should D. may 7. He knows the city so well. He ________ lived here for many years. A. may not have B. can have C. must have D. should 8. — Where is my notebook I can’t find it anywhere. — You ________ left it in the library. You went there this morning. A. may not B. must have C. can’t have D. should 9. She ________ finished the task so quickly. She just started it an hour ago. A. should have B. must have C. can’t have D. may have
10. You ______ eaten so much food. Now you have a stomachache. A. must have B. can’t have C. shouldn’t have D. may have
第二部分 翻译句子 1. 他不可能把作业落在家里了，早上我还看见他拿着呢。（can’t） 你本应该遵守承诺，不该临时反悔的。（should） 他们一定已经安全抵达了，只是还没来得及发信息。（must） 她今天没来上班，可能是家里出了什么急事。（may） 5. 你肯定读过这本书，不然不会对它这么了解。（must） 答案解析 一、单项选择 1. B，解析：刚在办公室见过，否定过去出国推测，用can’t have 2. B，解析：完全没听见铃声，肯定过去在睡觉，用must have 3. A，解析：门是锁着的，肯定过去已出门，用must have 4. A，解析：不确定结果，表过去可能挂科，用may have 5. D，解析：本该早说真相（没说），表过去虚拟，用should have 6. A，解析：地面全湿，肯定昨晚下大雨，用must have 7. C，解析：对城市极熟悉，肯定过去住了多年，用must have 8. B，解析：今早去过图书馆，推测笔记本大概率落那，用must have 9. C，解析：才开始1小时，否定过去能快速完成，用can’t have
10. C，解析：现在胃疼，表“本不该吃这么多却吃了”，shouldn’t have done。 二、翻译句子
1. He can’t have left his homework at home. I saw him holding it this morning. 2. You should have kept your promise and shouldn’t have gone back on it at the last minute. 3. They must have arrived safely, but they just haven’t had time to send a message. 4. She didn’t come to work today. She may have had something urgent at home. 5. You must have read this book, or you wouldn’t know it so well.Unit4 Helping out
情态动词
一、核心情态动词的推测用法
1. must
用法：表示非常肯定的推测，仅用于肯定句，语气最强。
例句： It must be your brother. I saw him in your room just now.
The light is on, so he must be at home.
2. may / might
用法：表示可能性较小的推测，可用于肯定句、否定句（may not/might not 表“可能不”，而非“不可能”）。
区别： might 比 may 语气更弱，可能性更低。
例句：Bring a map because you may want to travel around.
Take your swimming clothes because you might want to go swimming in the sea.
3. can / could
用法：多用于否定/疑问句，表“不可能/是否可能”，语气肯定，用于现在/将来的情况
否定：can’t = 不可能（把握极大），例：He can’t be late—he left an hour ago.
疑问：Can it be true （这可能是真的吗？）
肯定句表推测仅用于客观可能性（并非主观判断），例句：It can get very hot here in summer.（这里夏天可能会很热）
could 表推测
用法：可用于肯/否/疑问句，表“可能”，语气比can更委婉、不确定，可用于现在/将来/过去
现在：She could be busy now.（她现在可能很忙）
过去：He could have forgotten the meeting.（他可能忘了那场会议），could have done 还可表过去本可能做却未做（表虚拟，非单纯推测）
核心区别：
语气：can’t 否定推测语气极肯定；could 推测的不确定性更强，委婉度更高
时态：can 推测仅限现在/将来，could 可覆盖现在、将来、过去。
4. should / ought to
用法：表示“按常理/预期很可能”，语气比 must 弱，但比 may 强。
例句：
The train should arrive in 10 minutes.
They ought to be here by now—they left an hour ago.
二、否定推测的区别
can’t / cannot： 完全否定，“不可能”（语气最肯定） It can’t be my brother. He is still in France.
may not / might not： 部分否定，“可能不”（语气较弱） He might not come to the party—he’s been busy lately.
must not ： 不表推测，表“禁止、不许” You mustn’t smoke in the classroom.
三、高频易错点
1. must 的否定误区： must 表推测时，其否定形式不是 must not ，而是 can’t 。
正确：That can’t be Tom.
错误：That mustn’t be Tom.

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