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
Unit3情态动词（1） Day1
第一部分 单项选择 1. You ______ finish the science report before Friday, or you won’t have a chance to take part in the competition. A. can B. must C. need D. had better 2. —______ I take the reference book out of the reading room, sir —No, you ______. You can only read it here. A. Can; needn’t B. Must; mustn’t C. May; mustn’t D. Need; can’t 3. She ______ stay at home to look after her little sister because her parents are both on business this week. A. has to B. must C. should D. had better 4. You ______ play football in the street. It’s really dangerous for you and the passers-by. A. needn’t B. mustn’t C. shouldn’t D. can’t 5. —I can’t find my English notebook anywhere. —It ______ be in your schoolbag. You always put it there after class. A. can B. must C. should D. need 6. We ______ clean the classroom by ourselves. Our teacher said the cleaner wouldn’t come today. A. have to B. must C. had better D. can 7. —______ we bring any food to the picnic tomorrow —No, you ______. My mum has prepared everything for us. A. Must; needn’t B. Can; can’t C. Should; shouldn’t D. Had better; mustn’t 8. You ______ ask your teacher for help if you don’t understand the grammar rules. She is always ready to help us. A. must B. have to C. should D. need 9. The light in his study is off. He ______ be at home now. He may go out for a walk. A. mustn’t B. can’t C. needn’t D. shouldn’t 10. — I feel a little cold and have a headache. What ___ I do — You ___ drink more hot water and lie down to rest first. A. must; should B. can; had better C. need; have to D. should; mustn’t
第二部分 翻译句子 1. 我们必须在本周内完成这项英语调查。 2. 她因为生病，不得不请假在家休息。 3. 你最好不要在晚上大声听音乐，会打扰邻居。 4. 如果你努力练习，就能流利地说英语。 5. 我们应该多和家人沟通，增进彼此的理解。
答案解析 一、单项选择
1. B 解析：must表“必须”，语气强硬，符合“不完成报告就不能参赛”的强制要求；had better表建议，语气较弱，不符合语境。 2. C 解析：may用于请求许可，语气委婉；mustn’t表“禁止”，符合“阅览室书籍不能带出”的规则；can表许可时否定用can’t（不能），而非needn’t（不必），排除A。 3. A 解析：have to表“客观被迫”，因父母出差不得不照顾妹妹，强调客观原因；must表主观必须，不符合语境。 4. B 解析：mustn’t表“绝对禁止”，街道踢球是危险行为，属于明令禁止；shouldn’t仅表“不应该”，语气不如mustn’t强烈。 5. B 解析：must表肯定推测，语气最强烈，符合“总是把笔记本放书包里”的确定线索；can表推测仅用于否定/疑问句。 6. A 解析：have to表“客观被迫”，因清洁工不来，不得不自己打扫教室；must表主观要求，无客观前提，排除。 7. A 解析：must用于一般疑问句，否定回答用needn’t（不必），是固定搭配；can的否定回答是can’t，不符合“妈妈已准备好”的语境。 8. C 解析：should表“建议”，符合“不懂语法就问老师”的合理建议；must/have to表强制，need后接动词需加to，排除。 9. B 解析：can’t表否定推测，语气强烈，意为“不可能”，符合“书房灯关了，肯定不在家”的语境；mustn’t仅表禁止，不表推测。 10. B解析：第一空can表“可以、能够”，用于询问建议，符合“我可以做什么”的语境；第二空had better表“最好做某事”，提具体建议语气委婉贴合场景。A项must（必须）语气过强，D项mustn’t（禁止）逻辑矛盾，故选B。。
二、翻译句子
1. We must finish this English survey within this week. 解析：must表规章制度/任务的强制要求，语气坚定，贴合“必须完成调查”语境。 2. She has to ask for leave to rest at home because she is ill. 解析：have to表因客观原因（生病）被迫做某事，主语she为三单，用has to。 3. You had better not listen to music loudly at night, or you will disturb the neighbors. 解析：had better not do sth为固定结构，表“最好不要做某事”，带告诫意味。 4. If you practice hard, you can speak English fluently. 解析：can表具备某种能力，此处指通过努力获得“流利说英语”的能力。 5. We should communicate more with our family to improve mutual understanding. 解析：should表提建议、情理上的“应该”，无强制意味，贴合“建议多和家人沟通”的语境。
Unit3情态动词（1）
Day2 第一部分 单项选择 1. You ______ discuss the matter with Lisa and find out her strengths and weaknesses. A. should B. must C. can D. have to 2. You’re the director, but you don’t ______ deal with all the problems yourself. A. should B. must C. have to D. need 3. He ______ pass the ball to his teammates in the match. A. had better B. should C. can D. must 4. She ______ listen to others’ opinions instead of making decisions alone. A. can B. need C. should D. have to 5. We_____ keep quiet in the library. It’s a basic rule for everyone, and anyone who breaks it will be reminded seriously. A. must B. need C. can D. had better 6. You ______ be too hard on yourself, Tony. You’ve done a good job. A. have to B. mustn’t C. shouldn’t D. needn’t 7. We ______ use the tape to fix the broken tent. A. can B. must C. have to D. may
8. The team leader ______ take responsibility in times of disagreement. A. can B. must C. should D. had better 9. You ______ ask the team for help when you have problems. A. can B. must C. have to D. should 10. You ______ not keep everyone waiting for you again. A. should B. must C. can D. have to
第二部分 翻译句子
1. 首先，你应该和莉萨讨论这件事，找出她的优点和不足。
2. 你是导演，但不必独自处理所有问题。 他应该在比赛中把球传给他的队友。 她应该听取别人的意见，而不是独自做决定。 5. 你最好不要让大家再等你了。
答案解析
一、单项选择 1. A. should解析：，should 表建议，意为“应该”，符合语境。 2. C. have to解析：don’t have to 表示“不必”，强调客观上没有必要，符合“不必独自处理所有问题”的语义。 3. B. should解析：should 表建议，意为“应该传球给队友”。 4. C. should解析：should 表建议，意为“应该听取他人意见”，符合语境。 5. A. 解析：must表“必须”，强调主观规定/规则强制性，贴合图书馆要保持安静的硬性要求；need（需要）、can（能）不符合规则语境，had better（最好）语气太弱，选A。 6. C. shouldn’t解析：shouldn’t 表建议，意为“不应该对自己太苛刻”。 7. A. can解析：can 表“可以、能够”，指“可以用胶带修补帐篷”，符合语境。 8. C. should解析：should 表“应该承担责任”，符合团队领导的职责描述。 9. D. should解析：should 表建议，意为“遇到问题时应该向团队求助”。 10. A. should解析：shouldn’t 表“不应该”，指“不应该让大家再等你”。 二、翻译句子
1. First, you should discuss the matter with Lisa and find out her strengths and weaknesses. 2. You’re the director, but you don’t have to deal with all the problems yourself. 3. He should pass the ball to his teammates in the match. 4. She should listen to others’ opinions instead of making decisions alone. 5. You had better not keep everyone waiting for you again.
Unit3情态动词（1）
Day3 第一部分 单项选择 1. We ______ follow the traffic rules when we go to school every day. A. must B. should C. can D. need 2. You ______ drink more hot water if you have a cold. A. have to B. had better C. must D. can 3. They ______ get up early tomorrow, because they will take the first train. A. need B. should C. have to D. can 4. You ______ not touch the wet electric wire, it’s very dangerous. A. must B. should C. need D. have to 5. She ______ speak French very well, because she works as a translator. A. must B. can C. should D. need 6. We ______ not buy any fruit, my mother has already bought a lot. A. must B. should C. need D. have to 7. The students ______ finish their homework on time, it’s the school rule. A. can B. must C. should D. had better 8. You ______ ask your parents for advice before you make a big decision. A. should B. must C. have to D. can 9. He ______ stay at home because of the heavy rain, he can’t go out to play. A. need B. can C. have to D. has to 10. You ______ not be late for class, or the teacher will be angry. A. should B. can C. need D. have to
第二部分 翻译句子
1. 我们每天上学时必须遵守交通规则。 如果你感冒了，最好多喝热水。 他明天必须早起，因为他要赶第一班去北京的火车。。 我们不必买任何水果，妈妈已经买了很多。 5. 做重大决定前，你应该征求父母的意见。
答案解析
一、单项选择 1. A. must解析：must表硬性规则的“必须”，遵守交通规则是强制要求，符合语境。 2. B. had better解析：had better表针对具体情况的“最好做某事”，感冒多喝热水是针对性建议，带告诫意味。 3. C. have to解析：have to表因客观情况（赶首班火车）被迫做某事，主语they为复数。 4. A. must解析：must not表“严禁、绝对不能”，触碰湿电线有极大危险，用mustn’t表强制禁止。 5. B. can解析：can表“具备某种能力”，此处指能流利说法语的能力。 6. C. need解析：need not（needn’t）表“不必”，侧重客观上没有必要。 7. B. must解析：must表学校规章制度的强制要求，按时完成作业是校规，语气坚定。 8. A. should解析：should表情理上的“应该”，提建议且无强制意味，做决定征求父母意见是合理建议。 9. D. has to解析：have to表因客观情况（大雨）被迫做某事，主语he为第三人称单数，用has to。 10. A. should解析：should not表“不应该”，上课不迟到是基本行为准则，表建议性的禁止。
二、翻译句子
1. We must follow the traffic rules when we go to school every day. 2. You had better drink more hot water if you have a cold. 3. He has to get up early tomorrow because he needs to catch the first train to Beijing. 4. We need not buy any fruit, my mother has already bought a lot. 5. You should ask your parents for advice before you make a big decision.
Unit3情态动词（1）
Day4 第一部分 单项选择
1. —I feel a little tired. ______ I have a rest now —Of course you can. And you ______ drink more water to keep healthy. A. must; should B. can; should C. need; have to D. had better; must 2. You ______ play with fire in the forest. It ______ cause a terrible fire easily. A. mustn’t; can B. needn’t; must C. shouldn’t; need D. can’t; had better 3. —______ I finish all the homework today, Mr. Li —No, you ______. You can hand it in tomorrow morning. A. Must; needn’t B. Can; mustn’t C. Should; can’t D. Have to; shouldn’t 4. We ______ get to the train station before 8 o’clock, or we will miss the train. There is no other train today. A. can B. should C. have to D. need 5. You ______finish your homework before watching TV tonight — your teacher will check it tomorrow morning, so there’s no choice. A. can B. should C. have to D. had better 6. —What advice do you have for me —You ______ ask your teacher for help when you meet difficult problems. It’s the best way. A. had better B. can C. need D. have to 7. —______ I use your dictionary for a few minutes I left mine at home. —Sure, here you are. You ______ return it to me before class is over. A. Can; must B. Must; can C. Should; need D. Have to; had better 8. Everyone ______ follow the traffic rules when crossing the road. It’s very important for safety. A. need B. can C. should D. had better 9. You ______ eat too much junk food. It’s bad for your stomach and your weight. A. mustn’t B. needn’t C. can’t D. don’t have to 10. She ______ stay at home to look after her little sister, because her parents are both at work today. A. should B. has to C. can D. had better 第二部分 翻译句子
1. 你最好每天花半小时读英语。 我们必须记住所有的英语单词，因为下周有单词测试。 你不需要现在就做这道题，你可以放学后做。 他不得不步行去上学，因为他的自行车坏了。 5. 我们应该每天坚持锻炼，保持身体健康。
答案解析
一、单项选择 B，解析：第一空表请求许可用can，第二空表建议用should 2. A，解析：第一空表禁止用mustn’t，第二空表客观可能性用can 3. A，解析：must引导一般疑问句，否定回答固定用needn’t表不必 4. C，解析：客观条件迫使不得不做某事，用have to（must表主观必须） 5. C，解析：have to表“不得不”，强调客观条件（老师要检查）下的无奈，无选择余地；should（应该）表建议、had better（最好）表委婉建议，can（能）表能力，均不符合“没选择”的语境，故选C。 6. A，解析：表提建议且语气更强烈，用had better 7. A，解析：第一空表请求许可用can，第二空表硬性要求用must 8. C，解析：表适用于所有人的情理上的应该，用should 9. A，解析：表禁止做有害的事，用mustn’t 10. B，解析：客观情况迫使不得不照顾妹妹，主语she后用has to
二、翻译句子 1. You had better spend half an hour reading English every day. 2. We must remember all the English words because there will be a word test next week. 3. You needn’t do this problem now and you can do it after school. 4. He has to walk to school because his bike is broken. 5. We should keep exercising every day to keep our bodies healthy.
Unit3情态动词（1）
Day5 第一部分 单项选择
1. —Can I leave the classroom a little earlier today —No, you ______. Everyone must finish the exercise first. A. needn’t B. mustn’t C. shouldn’t D. don’t have to 2. You ______ take more exercise every day. It’s the best way to improve your physical health. A. had better B. need C. can D. have to 3. —Need we prepare the materials for the meeting this evening —No, we ______. The secretary will do it for us. A. mustn’t B. needn’t C. can’t D. shouldn’t 4. We ______ hurry to the bus stop right now, the last bus will leave in 5 minutes and there’s no other one. A. should B. can C. have to D. had better 5. —______ I borrow your notebook to copy the notes I was absent yesterday. —Certainly, but you ______ give it back to me before tomorrow’s class. A. Must; can B. Can; must C. Should; need D. Need; had better 6. You ______ tell him the secret, or the whole class will know it soon. A. mustn’t B. needn’t C. can’t D. shouldn’t 7. You ______ take the medicine after meals, or it will hurt your empty stomach badly. A. can B. must C. need D. had better 8. She ______ look after her sick mother at home, so she can’t go to the party with us tonight. A. should B. has to C. can D. had better 9. You______ take so much money with you when going out — mobile payment is very convenient now, and it’s not safe to carry cash. A. mustn’t B. had better not C. need D. have to 10. You ______ keep the book for two weeks at most, or you will have to pay a fine for it. A. can B. need C. should D. had better
第二部分 翻译句子 1. 我们应该对帮助过自己的人心存感激。（should） 2. 他们不得不改变计划，因为突然下起了大雨。（have to）
3. 我们应该认真对待每一次考试，不能粗心大意。（should; can’t）
4. 她不必这么早出发，公交车每十分钟就有一班。（needn’t）
5. 每个人都必须遵守学校的规章制度，无一例外。（must）
答案解析
一、单项选择 B，解析：can表请求许可，否定回答用mustn’t表明令禁止。 A，解析：表无客观约束的主观建议，had better（最好）贴合“改善健康”的场景，区别于表客观被迫的have to。 B，解析：need引导一般疑问句，否定回答固定用needn’t（不必）。 C，解析：“末班车5分钟后发车、无其他车次”是客观硬性约束，have to表“不得不”，语气强于表建议的should/had better。 B，解析：第一空表借东西的请求许可用can；第二空表“明课前归还”的硬性要求。 A，解析：表“绝对禁止说出秘密”，mustn’t表禁止，语气远强于仅表“不应该”的shouldn’t，贴合语境。 B，解析：“饭后吃药”是避免伤胃的硬性要求，must表“必须”，区别于表建议的had better，贴合“会严重伤胃”的强提醒。 B，解析：“照顾生病的妈妈”是客观情况迫使，主语she为三单，has to表“不得不”。 B解析：had better not表“最好不要”，提委婉建议。 A，解析：can表“能够/可以”，此处指图书馆借阅的允许时限，贴合“最多借两周，超期罚款”的规则场景；should/had better表建议，need表需要，均不符合语境。
二、翻译句子
1. We should be thankful to those who have helped us. 2. They have to change their plan because it suddenly rains heavily. 3. We should take every exam seriously and we can’t be careless. 4. She needn’t set off so early. There is a bus every ten minutes. 5. Everyone must obey the school rules and regulations without any exception.
Unit3情态动词（1） Day6 第一部分 单项选择
1. You ______ take the medicine with warm water only — the doctor warned it has special requirements for the solvent(溶剂). A. can B. must C. need D. had better 2. —Can I wear jeans to the school party —No, you ______. You have to wear the school uniform. A. can’t B. needn’t C. mustn’t D. shouldn’t 3. We ______ hurry up, or we will be late for the concert. The tickets are non-refundable（不可退）. A. can B. have to C. should D. had better 4. —Need she prepare for the speech tonight —No, she ______. The speech is put off till next week. A. mustn’t B. needn’t C. can’t D. shouldn’t 5. You ______ tell lies to your parents. They will be very sad if they know the truth. A. needn’t B. mustn’t C. shouldn’t D. don’t have to 6. —______ I use your computer to print my homework —Of course, but you ______ use it to play games. A. Can; mustn’t B. Must; can’t C. Should; needn’t D. Need; shouldn’t 7. He ______ stay in bed for a few days, because the doctor says he has a bad cold. A. may B. can C. needn’t D. had better 8. ______ we not go for a walk after dinner The air outside is so fresh today. A. Can B. Should C. Must D. Need 9. You ______ worry about your son. He is old enough to look after himself at school. A. needn’t B. mustn’t C. shouldn’t D. can’t 10. All the students ______ hand in their homework on time, or the teacher will be angry. A. can B. must C. should D. had better
第二部分 翻译句子 1. 他不得不待在家里，因为他发烧了，医生让他休息。（have to）
2. 你最好提前准备好明天的考试，不要临时抱佛脚。（had better）
3. 我们不能在图书馆大声说话，会影响其他人。（can’t） 4. 孩子们应该每天做一些家务，培养独立能力。（should） 5. 你不必带太多东西，这次旅行只有两天时间。（needn’t）
答案解析
一、单项选择
1. B，解析：由“医生提醒有溶剂特殊要求”可知是硬性规定，must表“必须”，强于表建议的had better，贴合医嘱的强制属性。 A，解析：can引导的请求许可疑问句，否定回答直接用can’t B，解析：门票不可退是客观约束，表“不得不”抓紧时间用have to B，解析：need引导一般疑问句，否定回答固定用needn’t B，解析：对父母撒谎是绝对禁止的行为，用mustn’t表“禁止” A，解析：第一空请求许可用can，第二空表禁止做某事用mustn’t D，解析：医生建议是较强烈的叮嘱，用had better表“最好做某事” B，解析：否定疑问句表提议“应该做某事”，用Should A，解析：由后句“能自己照顾自己”可知“不必担心”，用needn’t B，解析：表老师的硬性要求，不按时交作业会受批评，用must
二、翻译句子 1. He has to stay at home because he has a fever and the doctor asks him to rest. 2. You had better prepare for tomorrow’s exam in advance and not cram at the last minute. 3. We can’t speak loudly in the library, or we will disturb others. 4. Children should do some housework every day to develop their independence. 5. You needn’t take too many things. This trip only lasts for two days.
Unit3情态动词（1）
Day7 第一部分 单项选择 1. —I’m not feeling well. I ______ go to school today, right —No, you ______. But you ______ finish your homework online this evening. A. needn’t; must; have to B. don’t have to; needn’t; must C. can’t; can; should D. mustn’t; needn’t; should 2. You ______ tell him the secret. It’s between you and me only. A. needn’t B. mustn’t C. shouldn’t D. can’t 3. To protect the environment, we ______ throw litter everywhere in the park or on the street. A. needn’t B. mustn’t C. shouldn’t D. don’t have to 4. For online safety, students ______ tell strangers their personal information like phone numbers or home addresses online. A. needn’t B. can’t C. mustn’t D. shouldn’t
5. —______ I use your phone to call my mom Mine died just now. —Of course you ______. But you ______ return it to me in 5 minutes. A. Can; can; have to B. Need; need; must C. Must; must; should D. Should; should; can 6. She ______ stay up late these days because she’s preparing for the final exam, but she ______ do it too often—it’s bad for her health. A. has to; mustn’t B. must; shouldn’t C. should; needn’t D. can; can’t 7. We ______ order the right amount of dishes in the restaurant and take the leftovers home if there are any. A. must B. should C. have to D. need 8. —______ we keep quiet in the museum to respect cultural relics and other visitors —Yes, and we ______ touch the exhibits at all. A. Should; mustn’t B. Must; needn’t C. Can; can’t D. Had better; don’t have to
9. The sign says “No entry”, so we ______ go into that room. It’s for the staff only. A. needn’t B. mustn’t C. shouldn’t D. don’t have to 10. —I ______ finish reading this novel in three days —No, you ______. You can take a week, but you ______ keep it clean when you return it. A. Must; needn’t; have to B. Can; can’t; should C. Have to; don’t have to; mustn’t D. Should; shouldn’t; can
第二部分 翻译句子 1. 你最好不要熬夜，这对你的眼睛和身体都不好。（had better） 他不必做这么多作业，老师只布置了少量的。（needn’t） 我们必须按时到校，因为学校有严格的考勤制度。（must） 她不得不请假，因为她的奶奶生病住院了。（have to） 5. 我们应该学会独立解决问题，而不是总是依赖别人。（should）
答案解析 一、单项选择 1. B（第一空don’t have to表“不必”，贴合身体不适的客观语境；第二空needn’t呼应否定回答；第三空must表“必须”，强调作业的硬性要求） 2. B（mustn’t表“禁止”，秘密仅限两人知道，是明确的禁止行为，区别shouldn’t） 3. B（mustn’t表严格禁止，乱扔垃圾是环保层面明确禁止行为，语气强于shouldn’t）
4. C（mustn’t表绝对禁止，网络上向陌生人透露个人信息是校园网络安全的硬性禁忌）5. A（第一空Can表“请求许可”，语气委婉；第二空can呼应许可；第三空have to表“客观必须”，强调时间要求） 6. A（第一空has to表“客观不得不”，备考是客观原因；第二空mustn’t表“禁止”，避免过度熬夜的硬性提醒） 7. B（should表应该，节约粮食是倡导性的行为要求，符合社会倡议的语境，非强制） 8. A（第一空should表理应做，博物馆保持安静是基本礼仪；第二空mustn’t at all表“绝对不能”，贴合博物馆禁止触碰展品的规则） 9. B（mustn’t表“禁止”，结合“No entry”标识，是明确的禁止行为） 10. A（第一空Must表“必须”，提问时间要求；第二空needn’t表“不必”，是must否定回答的固定搭配；第三空have to表“客观必须”，强调还书的硬性要求）
二、翻译句子
1. You had better not stay up late. It’s bad for your eyes and your body. 2. He needn’t do so much homework. The teacher only gave a little. 3. We must get to school on time because the school has a strict attendance system. 4. She has to ask for leave because her grandma is ill in hospital. 5. We should learn to solve problems by ourselves instead of always depending on others.Unit3 What makes a great team
情态动词
一、情态动词的定义
情态动词是用来表达说话人情绪、态度、语气的助动词，比如建议、命令、能力、许可等。
不能单独作谓语，必须和动词原形一起使用
没有人称和数的变化（第三人称单数也不加 -s ）
否定形式通常是在其后直接加 not
二、 情态动词的分类及核心用法
1.should
基本含义：应该、应当（表建议、责任、义务），否定形式should not（shouldn’t）表示不该的意思。
肯定句：You should listen to the doctor's advice.
否定句：You shouldn't eat too much junk food.
一般疑问句：Should I take an umbrella with me
肯定回答：Yes, you should.
否定回答：No, you shouldn't.
2.must
基本含义：必须、一定（表命令、强烈建议或推测），否定形式must not（mustn’t）表示不应该，禁止的意思。
肯定句：She must learn to manage her time better.
否定句：You mustn't talk loudly in the library.（表“禁止”，语气强硬）
一般疑问句：Must I come before 6:30 tomorrow
肯定回答：Yes, you must.（表示一定要）
否定回答：No, you needn't. / No, you don't have to.（表示没必要）
考点：
must 否定回答的易错点，不用 mustn't （禁止）。
must vs have to：
must 侧重于说话者的主观看法，认为有必要或有义务去做某事。have to 侧重于客观需要，含有“不得不，被迫”之意。
3.can
基本含义：can 意为“请求允许”和“给予许可”，可用于肯定句、否定句和疑问句。否定形式 cannot (can't) 表示“不能，不可以”，语气弱于 must not (mustn't)。
肯定句：You can borrow my bike this afternoon.（给予许可）
否定句：You can't take photos in the museum.（拒绝许可/禁止）
一般疑问句：Can we go home now, please
肯定回答：Yes, you can.（表示允许）
否定回答：No, you can't.（表示不允许）
请注意：这里的 can 与以前我们所学的 can 意义不同，以前我们所学的 can 表示“能力”，这里表示“允许”。

4.need
基本含义：需要（可作情态动词也可作实义动词），用于肯定句、否定句和疑问句，否定形式为need not(needn’t)，意思时不需要，不必要。need做实义动词时，常用于need to do sth句型。
肯定句：If she wants anything, she need only ask.
否定句：You needn't worry about me.（不必）
一般疑问句：Need I report it to the police
肯定回答：Yes, you must.（表示必须做）
否定回答：No, you needn't.（表示没必要）
5. have to
基本含义：不得不（表客观需要，强调外界压力或规定），否定形式don’t have to（不必）=needn’t。
肯定句：My bike was broken yesterday, so I had to walk to school.
否定句：You don't have to wear a tie to the party.（= You needn't...）
一般疑问句：Do you have to work on weekends
肯定回答：Yes, I do.
否定回答：No, I don't.
考点
have to 和 must 的区别（见上文 must 部分），另外have to 有时态变化（ has to , had to , will have to ），而 must 没有。
had better
基本含义：最好（表强烈建议，语气比 should 更直接），否定形式had better not。
肯定句：You had better take a taxi, or you'll be late.
否定句：You had better not stay out too late.

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