2017届高考英语（人教版）一轮教师文档讲义：必修3 unit 2

2017届高考英语（人教版）一轮教师文档讲义：必修3 unit 2

‎ [话题素材——健康饮食]‎ 好词 ‎1．healthy adj. 健康的 2.delicious adj. 美味的；可口的 ‎3．beneficial adj. 有益的；有好处的 4.digest vt. 消化；吸收 ‎5．balance n. & vt. 平衡 6.put_on_weight 增加体重 ‎7．keep sb. fit 使某人健康 8.be of benefit 有益的 ‎9．get overweight 变得肥胖 10.recover_from 从……恢复过来 ‎11．cut_down 砍倒；消减 12.go/be on a diet 节食 ‎13．be abundant in 富含有…… 14.take/do_some_exercise 进行运动；锻炼 ‎15．get into the habit of 染上……的习惯 佳句 ‎1．It is my advice that middle_school_students_should form_a_healthy_eating_habit.‎ 我建议，中学生应该养成健康的饮食习惯。‎ ‎2．It is hoped that whoever_supplies_unhealthy_food should be severely punished by law.‎ 人们希望无论是谁提供不健康的食品按照法律应该受到严厉的惩罚。‎ ‎3．The majority of people take in too much fat and not enough fibre, which_does_great_harm_to_their_health.‎ 大多数人摄入的脂肪太多，纤维不足，这对他们的健康有害。‎ ‎[精美语篇]‎ Last week， some of us made a survey about middle school students' health.,The survey shows that the general health of middle school students is declining year by year， with more people having the problem of overweight. One of the reasons could be that they have a heavy load in their study so that they seldom do physical exercises. What's more， they don't do labour work like housework and they don't have a balanced diet. To solve the problem， experts advise that we should not chat online too long to have enough sleep and we should do sports for at least one hour a day. Besides， we'd better eat more fruits and vegetables and refuse junk foods. ‎ ‎ 高频单词 ‎1．diet (n.) 日常饮食(vi.) 节食 ‎2．roast (adj.) 烤制的 (vt. & vi.) 烤；烘；烘烤 ‎3．fry (vt.&vi.) 油煎；油炸 ‎4．ought (v. & aux.) 应当；应该 ‎5．slim (vi.) 变细；减肥 (adj.) 苗条的；纤细的 ‎6．raw (adj.) 生的；未加工的 ‎7．discount (n.) 折扣 ‎8．consult (vt.) 咨询；请教；商量 ‎9．digest (vi.& vt.) 消化 (n.) 摘要；概要 ‎10．debt (n.) 债；债务 ‎11．glare (vi.) 怒目而视；闪耀； (n.) 怒视；炫目的光 ‎12．spy (vi.& vt.) 窥探；秘密监视； (n.) 间谍；侦探 ‎13．balance (vt.) 平衡；权衡 (n.) 天平；平衡→balanced (adj.) 均衡的 ‎14．curious (adj.) 好奇的→curiously (adv.) 好奇地→curiosity (n.) 好奇心 ‎15．lie (n.) 谎话；谎言；(vi.) 说谎→lied (过去式)→lied (过去分词)‎ ‎16．weakness (n.) 缺点；虚弱；弱点→weak (adj.) 弱的；虚弱的→weaken (vt.) 使变弱 ‎ ‎17．strength (n.) 强项；长处；力量→strong (adj.) 强壮的；强大的→strengthen ( vt.) 加强 ‎18．limit (vt.) 限制；限定；(n.) 界限；限度→limited (adj.) 有限的 ‎19．benefit (n.) 利益；好处；(vt.&vi.) 有益于；有助于；受益→beneficial (adj.) 有益的；有好处的 ‎20．combine (vt.&vi.) (使)联合；(使)结合→combination (n.)‎ ‎ 重点短语 ‎1．in_debt　　　　　　　　　欠债；负债 ‎2．lose_weight 减肥；体重减轻 ‎3．put_on_weight 增加体重 ‎4．win...back 赢回；重新获得 ‎5．cut_down 削减；删节 ‎6．tell_a_lie 说谎 ‎7．glare_at 怒目而视 ‎8．spy_on 暗中监视；侦查 ‎9．get_away_with 被放过；(做坏事)不受惩罚 ‎10．before_long 不久以后 ‎11．ought_to 应当；应该 ‎12．be_on_a_diet 节食 ‎13．earn_one's_living 谋生 ‎ 热点句型 ‎1．“否定词＋形容词的比较级”表最高级含义 ‎“Nothing could_be_better (更好的了)，” he thought. (教材P10)‎ ‎2．must have done表推测 Something terrible must_have_happened_ (一定发生了) if Li Chang was not coming to eat in his restaurant as he always did. (教材P10)‎ ‎3．have sb./sth. doing...允许某人/某物做……或让某人/某物一直做……‎ He could not have Yong Hui getting_away_with_telling_people_lies (允许……哄骗人们却不受惩罚)! (教材P10)‎ ‎4．Why don't you...？表建议 ‎ Why_don't_you_sit_down (你为什么不坐下来)and try a meal? (教材P14)‎ ‎5．现在分词短语作伴随状语doing...‎ Wang Peng sat in his empty restaurant feeling_very_frustrated (感到十分沮丧). (教材P10)‎ ‎ 教材复现 在空白处填入适当的内容(1个单词)或括号内单词的正确形式。‎ ‎1．Suddenly he saw his friend Li Chang ________ (hurry) by.‎ 答案：hurrying　考查“see＋宾语＋宾补”结构。hurry与his friend 之间为主动关系，且表正在进行。‎ ‎2．He could not have Yong Hui ________ (get) away with telling people lies!‎ 答案：getting　考查“have＋宾语＋宾补”的用法。get 与宾语之间为主动关系，此处表示“让某人一直做……”。故填getting。‎ ‎3．Perhaps ________ a discount and a new sign he could win his customers________.‎ 答案：with; back　第一空考查with的用法。表示“通过，使用”；第二空为固定短语，win back意为“赢回”。‎ ‎4．Their balanced diets became such a success ________ before long Wang Peng became silmmer and Yong Hui put ________ more weight.‎ 答案：that; on　第一空考查句式“such...that...”；第二空考查固定短语“put on weight”，意为“增加体重”。‎ ‎5．Wany Peng was amazed ________ this and especially at the prices.‎ 答案：at　考查固定短语，be amazed at 意为“因……而惊讶”。‎ ‎6．Something terrible ________ have happened if Li Chang was not coming to eat in his restaurant ________ he always did.‎ 答案：must; as　第一空考查情态动词，表示对“过去情况非常肯定的推测”用must have done；第二空考查as的用法，表示“正如，像……”。‎ ‎7．But don't you think it would be better if you were a bit ________ (thin)．‎ 答案：thinner 　考查形容词的比较级，a bit修饰比较级。‎ ‎8．I found your menu so ________ (limit) that I stopped ________ (worry) and started advertising the benefits of my food.‎ 答案：limited; worrying　第一空考查词形转换“find＋宾语＋adj.”，limited“有限的”；第二空考查“stop doing sth.”。‎ ‎9．According ________ my research, neither your restaurant nor mine ________ (offer) a balanced diet.‎ 答案：to; offers 　第一空考查according to意为“根据”‎ ‎；第二空考查主谓一致，谓语动词就近原则。‎ ‎10．They were both enjoying dumplings and breast of chicken ________ (cook) with garlic.‎ 答案：cooked　考查非谓语动词作定语。cook与chicken之间为被动关系，故用cooked。‎ ‎1　　balance　n．天平；平衡；收支差额　v．平衡；权衡重要性 What will happen to you if you don't eat a balanced diet？(P9)‎ 如果你不均衡饮食的话，会怎么样呢？‎ ‎(1)keep the balance of nature 保持生态平衡 keep one's balance 保持平衡 lose one's balance (＝be out of balance) 失去平衡 off balance 不稳 ‎(2)balance sth. against 权衡；斟酌；比较 ‎(3)balanced adj. 保持(或显示)平衡的 keep a balanced diet 保持饮食均衡 ‎①[2015·湖北高考]When he was running after his brother, the boy lost_his_balance and had a bad fall.‎ 男孩在追他哥哥时，失去了平衡，重重地摔了一跤。‎ ‎②[2014·辽宁高考]Move slowly, then be sure to keep_your_balance and don't let your body shake.‎ 慢慢地移动，然后确保要保持平衡，不要让你的身体晃动。‎ ‎③[2014·天津高考]It was then that I started to appreciate the tough choices she had to make on balancing_family_and_work. ‎ 正是那时我才开始理解她为了平衡家庭和工作做出的那些艰难的选择。‎ ‎④[必背佳句]Nowadays, the balance of nature is being destroyed and the weather is getting warmer and warmer.‎ 现在，大自然的平衡正在被破坏，天气变得越来越暖和。‎ 图解助记　‎ 掌握“平衡”‎ ‎2　　lie　n．谎言；谎话　vi.说谎；躺；位于；坐落在 He could not have Yong Hui getting away with telling people lies！(P10)‎ 他可不能让雍慧哄骗别人却不受惩罚！‎ ‎(1)tell a lie＝tell lies 撒谎；说谎话 a big lie 弥天大谎 a black lie 用心险恶的谎言 a white lie 善意的谎言 ‎(2)lie to sb. 对某人撒谎 lie in 位于；在于 ‎①[2014·湖南高考]There is no greater pleasure than lying on my back in the middle of the grassland, staring at the night sky.‎ 没有什么比我躺在草地的中间，凝视着夜空更快乐的事了。‎ ‎②[2015·福建高考]With great interest, he read everything he could lay_his_hands_on,_ listened to the town elders and learned about the world beyond his tiny hometown.‎ 他很有兴趣地读着他能找得着的一切，听着城里老年人说着话并了解着他小小的家乡以外的世界。‎ ‎③[必背佳句]Where I disagree with you lies_in what you have said disagrees with what you have done.‎ 我不同意你的地方在于你言行不一。‎ 易混辨析 原形 词性 词义 过去式 过去分词 现在分词 lie vi.‎ 撒谎 lied lied lying vi.‎ 躺、卧 lay lain lay vt.‎ 产卵、下 蛋；摆放 laid laid laying ‎④[一言辨异]The boy lying under the tree lied that he lay in bed and laid a cock in a box and ‎ saw it laying an egg.‎ 躺在树下的男孩撒谎说他躺在床上把公鸡放在盒子里看见它下了一个蛋。‎ ‎3　　limit　vt.限制；限定　n．界限；限度 I don't want to upset you, but I found your menu so limited that I stopped worrying...(P14)‎ 我不想让你心烦，不过我发现你菜谱上的菜色太少了，我也就不着急了……‎ ‎(1)beyond/over the limit 超过限度 within the limit of 在……范围内 set a limit to sth. 对……规定限度 ‎(2)limit...to... 把……限制在……‎ be limited to 局限于 ‎①[2015·湖北高考]Those ponies who have gone beyond_their_limited_area can be returned to their correct area.‎ 那些已经超出了他们限定区域的小马驹可以被送回到正确的区域。‎ ‎②[2015·上海高考]At_a_time_of_limited_means_of_expression,_snow was like free art supplies dropped from the sky.‎ 在那时，表达方式的方法有限，雪就像是来自于上天的一种自由艺术。‎ ‎③[2014·江西高考]Sometimes, he was_limited_to a cage underwater but that did not bother him.‎ 有时候，他被限制在水下的一个笼子里，但是这并没有困扰他。‎ ‎④The major challenge of this century is to find ways to meet the needs of a growing population within_the_limits_of this single planet.‎ 本世纪主要的挑战是要找到一些方法以满足在我们有限的地球范围内日益增多的人口的需要。‎ ‎4　　strength n．[C]长处；强项　[U]力量；体力 The strength of the diet in Wang Peng's restaurant was that it provided plenty of energy－giving food.‎ 王鹏餐馆的饮食优点在于它能提供含有足够热量的食物。‎ ‎(1)build up one's strength/body 强身健体 strengths and weaknesses 优点和缺点 The strength of... is that... ……的优点是……‎ ‎(2)strengthen vt.&vi. 加强 ‎①[2015·安徽高考]It can provide students with instant feedback, including reports about their strengths_and_weaknesses. ‎ 它可以给学生们提供即时反馈，其中包括他们优势和弱势的报告。‎ ‎②[2015·江苏高考]People volunteer to express personal values related to unselfishness, to expand their range of experiences, and to strengthen_social_relationships.‎ 人们自愿表达与无私相关的个人价值，扩展他们的经历，并强化社会关系。‎ ‎③[2014·辽宁高考]And the best way to_strengthen_willpower is to make it into a habit.‎ 增强意志力最好的方式就是让它成为一种习惯。‎ ‎④[必背佳句]Practicing Chinese kung fu can not only build_up_one's_strength,_but also develop one's character.‎ 练中国功夫不但能增强体质，还能培养一个人的品质。‎ 易混辨析 strength 指固有的潜力。指人时，意为“力气”；指物时，意为“强度”‎ energy 主要指人的精力或自然界中的能量、能源 power 主要指做一件事所依靠的能力、功能；也可指人或机器等潜在的或所能发挥出来的力量；还可指职权、权力或政权 force 主要指自然界的力量、暴力、势力以及法律、道德、感情的力量和军事力量等 ‎5　　benefit　n．利益；好处　vt.& vi.有益于；有助于；受益 ‎...I stopped worrying and started advertising the benefits of my food.(P14)‎ ‎……我也就不着急了，并开始宣传我餐馆的食物的好处。‎ ‎ (1)benefit from/by 从……受益，得益于 benefit sb. 对某人有益 ‎(2)be of (much, great) benefit to sb.‎ ‎＝be beneficial to sb. 对某人有益处 for the benefit of... 为了……的利益 ‎①[2015·江苏高考]Many of the things we_now_benefit_from would not be around but for Thomas Edison.‎ 要不是爱迪生的发明，今天我们身边享用的很多东西都将不复存在。‎ ‎②You'd better keep a balanced diet for_the_benefit_of your health.‎ 为了有益于身体健康你最好均衡饮食。‎ ‎③[2014·江西高考]It_really_benefited_me_a_lot to preview lessons, get actively involved in ‎ class, and review what had been taught after class.‎ 课前预习，课堂上积极参与，课后复习所学知识，的确让我受益匪浅。‎ ‎④[必背佳句]The method of learning English is of_much_benefit and I believe I can benefit_from it.‎ 这种学英语的方法大有益处，我相信我能从中获益。‎ 过关演练 单句语法填空 在空白处填入适当的内容(1个单词)或括号内单词的正确形式 ‎1．[2015·广东高考]After detection, we can realize we should ________ (strength) our bodies.‎ 答案：strengthen　考查词形转换。分析句子结构可知，此处应填动词，意为“加强”。‎ ‎2．From my point of view, our library should buy some popular, science books and library books because they are ________ great benefit to us.‎ 答案：of　考查“of＋抽象名词”结构相当于形容词。‎ ‎3．________ this way they cut ________ the fat and increased the fibre in the meal.‎ 答案：In; down　考查固定短语“in this way”意为“用这种方法”；“cut down”意为“削减”。‎ ‎4．You have to balance the advantages of living in the countryside ________ the disadvantages.‎ 答案：against　balance sth. against sth. “权衡……”。句意：你必需要权衡一下住在农村的利与弊。‎ ‎5．Children are often full of ________ (curious) and they take great interest in everything.‎ 答案：curiosity　考查词形转换。介词of后面应该为名词，故填curiosity。‎ ‎6．The firm is working on a new product in ________ (combine) with several over seas partners.‎ 答案：combination　考查词形转换。介词in后应为名词，故填combination。‎ ‎7．I'm ________ a diet now and I don't want to put ________ weight.‎ 答案：on; on　第一空考查“be on a diet”意为“节食”；第二空考查“put on weight”意为“增加体重”。‎ ‎8．The child said that he had ________ (lay) the pen on the desk, but I thought he ________ (lie) to me.‎ 答案：laid; lied　第一空考查“放”的过去分词形式；第二空考查lie表示“撒谎”时的过去式。‎ ‎9．His English was so ________ (limit) that he couldn't even tell the foreign friend where he was from.‎ 答案：limited　考查词形转换，此处应填形容词作表语。‎ ‎10．A new round of competition for customers has started with ________ (discount) products in Gome and Sunning, setting off a wave of shopping rush at the end of the year.‎ 答案：discounted　考查词形转换。结合语意可知，商品是被打折扣的，故填过去分词。‎ ‎1　　get away with 被放过；(做坏事)不受惩罚；携某物潜逃 ‎ He could not have Yong Hui getting away with telling people lies！(P10)‎ 他可不能让雍慧哄骗人们却不受惩罚！‎ ‎①[2015·湖北高考]Fortunately, I managed to_get_in_touch_with a Dartmoor's Livestock Protection officer and send her a photo.‎ 幸运地是，我联系上了Dartmoor's Livestock Protection中的一位官员并发给她一张照片。‎ ‎②[2015·课标全国卷Ⅱ]Gradually, this noise began to appear during a show, and to_get_rid_of_it,_I had to change to another channel and then change it back.‎ 逐渐地，在一次节目中这种噪音开始出现，为了除掉这种噪音，我不得不更换另外频道然后再换回来。‎ ‎③The boy is too naughty. You shouldn't let him get_away_with_breaking_the_windows.‎ 这个男孩太淘气了。你不应该对他打破窗户不进行惩罚。‎ ‎④I have learned to get_over bad life's experiences and learned how to move on because of her.‎ 因为她，我已经学会了克服生活中不愉快的事情，并且学会怎样坚持下去。‎ ‎⑤[2015·江苏高考]Who knew that so many years later I would look to Dr Bernie and his CDs again to get_through my own cancer experience?‎ 谁会知道那么多年后我会再次注意到Dr Bernie以及他的CD来渡过我癌症的难关呢？‎ ‎2　　in debt 负债 He did not look forward to being in debt because his restaurant was no longer popular.(P14)‎ 他不希望由于餐馆不受欢迎而负债。‎ ‎(1)be in debt 欠债；负债(表状态)‎ be out of debt 还清债务(表状态)‎ ‎(2)pay off the debts 还清债务(表动作)‎ get/run into debt负债(表动作)‎ ‎(3)be in one's debt 欠某人的情 ‎①[2015·课标全国卷Ⅱ]New students are now aware that they are likely to leave university up to ￡ 15,000 in_debt.‎ 新学生现在意识到他们很可能会欠大学15000英镑的债务。‎ ‎②[2015·天津高考]The finest and happiest years of our lives were not when all_the_debts_were_paid,_and all difficult experiences had passed, and we had settled into a comfortable home.‎ 最美好最快乐的人生时段并不是我们的债务都还清的时候，并不是所有的困难经历都过去的时候，也不是我们迁入了一幢舒适的家园的时候。‎ ‎③[2014·江西高考]Starting your own business could be a way to achieving financial independence. On the other hand, it could just put_you_in_debt.‎ 开始你自己的事业可能是一种获得经济独立的方法。另一方面，它可能将你置于债务之中。‎ ‎④[必背佳句]It is much easier to_get_into_debt than to_get_out_of_debt.‎ 借债容易还债难。‎ ‎3　　cut down 砍伐；削减，降低 In this way they cut down the fat and increased the fibre in the meal.(P15)‎ 这样，他们减少了脂肪，增加了食物里的纤维。‎ ‎①[2015·浙江高考]Living in a glare of our own making, we have cut_ourselves_off from our evolutionary and cultural heritage—the light of the stars and the rhythms of day and night.‎ 生活在一个刺眼世界，我们已经远离了进化和文化遗产，星星和昼夜节律的光。‎ ‎②[2014·江西高考]－Tony, why are your eyes red?‎ ‎——Tony, 你的眼睛为什么这么红？‎ ‎－I have_been_cutting_up peppers for the last five minutes.‎ ‎——我在过去的5分钟里一直在切辣椒。‎ ‎③[2014·湖北高考]The community college has to cut_down on staff to save money.‎ 为了省钱，那所社区学院只好裁员。‎ ‎④[必背佳句]Immediate actions should be taken, like stopping cutting_down trees, to better the environment.‎ 应马上采取行动来改善环境，例如停止砍伐森林。‎ ‎过关演练 选词填空 put on weight； get away with； before long； in debt； earn one's living； cut down； spy on； win back； be tired of； throw away ‎1．[2015·安徽高考]The result is that we ________ useful possessions to make room for new ones.‎ 答案：throw away ‎2．All those present ________ his long and dull speech and some even left the meeting room.‎ 答案：were tired of ‎3．I really ought to go on a diet. I ________ so much since I gave up jogging.‎ 答案：have put on weight ‎4．With so many areas of forests ________， a lot of wildlife is losing its natural habitat.‎ 答案：cut down ‎5．As a responsible teacher, he won't have students ________ cheating in the exam.‎ 答案：getting away with ‎6．Once you lie to others, it's difficult to ________ their trust in you.‎ 答案：win back ‎7．The spy caught ________ the military base was sentenced to 20 years in prison and was limited to no relative visiting.‎ 答案：spying on ‎8．The country ________ for a year because of the financial crisis. Now things have improved a little.‎ 答案：has been in debt ‎9．It is difficult for him ________ as a musician living in a small city.‎ 答案：to earn his living ‎10．________， the noise dropped completely and the boat began to drift gently across the water.‎ 答案：Before long ‎1　　“Nothing could be better，”he thought.(P10)‎ 他想：“再没有比这些更好吃的了。”‎ 否定词与比较级连用，实际上表示的是最高级的含义。‎ 表示最高级意义的几种特殊结构：‎ ‎(1)never＋比较级 ‎(2)＋比较级＋than ‎(3)比较级＋than＋ 语境助记 ‎①[2015·湖南高考]As a student, I can tell you that there is nothing_better_than being praised by my teacher before my classmates.‎ 作为一名学生，我告诉大家没有什么比在同学面前受到表扬更好的事了。(这是最好的事情)‎ ‎②[2015·天津高考]But what I still can't figure out is why I never got tired, never_felt_better in my life.‎ 但是我至今不明白的是为什么我从未疲倦，在我人生中感觉那么好。‎ ‎③Mr Stevenson is great to work for－I really couldn't_ask_for_a_better_boss.‎ 为史蒂文森先生工作真好——我实在找不到比他更好的老板了。‎ ‎④It was not until then that I suddenly realized nobody was happier_than I was.‎ 直到那时我突然意识到没有人比我更幸福了。‎ 过关演练 Ⅰ.单句语法填空 用括号内单词的正确形式填空 ‎1．It is wrong for some parents to have their children ________ (study) all day on weekends.‎ 答案：studying　考查“have＋宾语＋doing”结构，表示“让……一直做某事/一直处于……状态”。‎ ‎2．—What do you think of the hotel?‎ ‎—Wonderful. You couldn't have found a ________ (good) one.‎ 答案：better　考查否定词与形容词副词比较级的连用表最高级的用法。‎ ‎3．I had my watch ________ (repair) because it didn't work.‎ 答案：repaired　考查“have＋宾语＋宾补”的用法。其中watch与repair之间为被动关系，故用repaired。‎ Ⅱ.完成句子 ‎1．The teacher ________________ at school.‎ 老师决不容忍他的学生迟到。‎ 答案：can't have his students being late for class ‎2．The boy broke the school regulations and the teacher ________________ outside the classroom all day.‎ 这个男孩违反了学校的规章制度，老师让他整天站在教室外面。‎ 答案：had him standing ‎3．Walking exercises may be boring at times, but on a clear sunny morning ________________.‎ 有时候散步有点无聊，但在一个晴朗的早上，没有比这更好的啦。‎ 答案：nothing could be better than this 情态动词( Ⅱ )‎ ought to/ought not to ‎ ought to意为“应该，应当”，其后必须跟动词原形，只有一种形式，没有人称和数的变化。‎ ought to的否定形式为ought not to或oughtn't to，其一般疑问句形式是将ought置于主语前。‎ We ought to stop polluting nature.‎ 我们应该停止污染大自然。‎ You oughtn't/ought not to scold him.‎ 你不该责备他。‎ have to/don't have to/mustn't ‎1．情态动词have to(口语中说成have got to)表示客观需要做的事情，意为“必须；不得不”。有时态、人称和数的变化，其否定式和疑问式应由助动词do构成。‎ ‎2．have to的否定式为don't have to，表示“没有义务或没有必要做某事”，意为“不必”，常可以回答must提问的一般疑问句。而must的否定式mustn't表示“禁止”。‎ ‎—Must I do it at once? ‎ 我必须马上做吗？(作出肯定、否定回答)‎ ‎—Yes，you have to(＝Yes, you must)．/No，you needn't(＝No，you don't have to)．‎ 是的，你必须。/不，你不必。‎ You mustn't go out alone at night.‎ 晚上你一定不能独自出去。‎ I had to leave yesterday.‎ 昨天我不得不离开。‎ need/needn't need表示“需要”或“必要”，既可以作情态动词，也可以作实义动词，但是它们的用法不同。‎ ‎1．作为情态动词，“need”通常用于否定句和疑问句。‎ He needn't pay for it.‎ 他没必要付钱。‎ ‎—Must I type this letter again?‎ 我需要把信再打印一遍吗？‎ ‎—No，you needn't(＝you don't have to)．/Yes, you must ‎(＝you have to)．‎ 不，你不必。/是的，你必须。‎ ‎2．作为实义动词，同其他实义动词一样，可用于各种句式，有时态、人称、数的变化，构成否定句和疑问句时要借助于助动词do或does。‎ We need to help him.‎ 我们得帮助他。‎ We don't need to tell him the truth.‎ 我们不必告诉他真相。‎ 过关演练 单句语法填空 在空白处填入适当的内容(1个单词)或括号内单词的正确形式 ‎1．The weather turned out to be fine yesterday. I ________ have taken the trouble to carry my umbrella with me.‎ 答案：needn't 　考查情态动词用法。根据句意可知此处表示“本没必要做的事情反而做了”。‎ ‎2．[2015·福建高考]On the way, they ________kick or throw their cheese, or go into their competitors' lane.‎ 答案：mustn't　考查情态动词用法。根据语意可知，此处表示“禁止做……”，故填mustn't。‎ ‎3．[2015·北京高考]In order to become transparent, an animal needs ________ (keep) its body from absorbing or scattering light.‎ 答案：to keep　考查need作为实义动词的用法。主语与keep之间为主动关系，故应填to keep。‎ ‎4．[2015·北京高考]—Can't you stay a little longer?‎ ‎—It's getting late. I really________ go now. My daughter is at home alone.‎ 答案：must　此处表示“必要性”，故应填must。‎ ‎5．You ________ feel all the training a waste of time, but I'm a hundred percent sure later you'll be grateful you did it.‎ 答案：may/might　根据题干中的“but I'm a hundred percent sure later”可知设空处表示“不确定，没把握”，故用might/may。‎