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1、Unit 3 talk about be different fromas well as well asfind outfill with compare with be free to do sth.make sure 谈论谈论不同于不同于也；还有也；还有(除除.之外之外)也也, 既既.又又发现；找出来发现；找出来用用装满装满把把跟跟比较比较自由地去做某事自由地去做某事确保；一定确保；一定Translate the phrases into English.IWhat do they mean?“禁止做某事禁止做某事”的句型总结的句型总结（1）No + v.-ing! No talking
2、!（2）否定祈使句。）否定祈使句。 Dont jump.（3）情态动词）情态动词must表示表示“禁止禁止”。 You mustnt play with fire.（4）cant表示表示“不允许不允许”。 You cant make any noise.（5）You arent allowed to 表示表示“不允许不允许对方做某事对方做某事”。 You arent allowed to watch TV at home before you finish your homework. 祈使句用来表达叮嘱、劝告、希望、禁祈使句用来表达叮嘱、劝告、希望、禁止、警告、请求或命令等。祈使句最常用止、
3、警告、请求或命令等。祈使句最常用来表达命令。来表达命令。 Go and wash your hands. 快去洗手。快去洗手。 （命令）（命令） Be quiet, please. 请安静。请安静。 （请求）（请求） Be kind to our sister. 要对我们的妹妹友善。要对我们的妹妹友善。 （劝告）（劝告） Watch your steps. 走路小心。走路小心。 （警告）（警告） No littering. 不要乱扔垃圾。不要乱扔垃圾。 （禁止）（禁止） Dont forget to take an umbrella. 不要忘了带雨伞。不要忘了带雨伞。 （叮嘱）（叮嘱）祈使句的
4、特点：祈使句的特点： (1) 祈使句一般没有主语，说话的对象都是祈使句一般没有主语，说话的对象都是第二人称第二人称“你你”或或“你们你们”，所以也可以，所以也可以理解为省略了主语理解为省略了主语you。祈使句末用句号或。祈使句末用句号或惊叹号，句子读时用降调。惊叹号，句子读时用降调。 (2) 以动词原形开头，无时态和数的变化。以动词原形开头，无时态和数的变化。 (3) 祈使句的否定形式是在动词原形前加祈使句的否定形式是在动词原形前加dont。 Please close the door. 请把门关上。请把门关上。 Sit down, please. 请坐。请坐。(4) 在表达请求时，可以加上在
5、表达请求时，可以加上please; 表达表达比较强烈的语气时，可以用感叹号。比较强烈的语气时，可以用感叹号。 Come to my office. 到我办公室来。到我办公室来。 Stop! 停！停！ Hurry up! 快点！快点！ Please dont do it. 请不要这么做。请不要这么做。 Dont be late again. 不要再迟到了。不要再迟到了。 Dont worry. Be happy. 不要担心，高兴点儿。不要担心，高兴点儿。 Dont bring any food or drink into the lab next time. 下次不要把任何食物或饮料带到实验下次
6、不要把任何食物或饮料带到实验室来。室来。 Dont forget to turn off the lights. 不要忘记关灯。不要忘记关灯。 Dont stand up. 别站起来。别站起来。 Dont be careless. 别粗心。别粗心。 Dont let them play with fire. 别让他们玩火。别让他们玩火。(5) Lets 构成的祈使句往往用于提出建议。构成的祈使句往往用于提出建议。否定形式为：否定形式为：Let + 宾语宾语 + not + 动词原动词原形形 + 其它成分。如：其它成分。如： Lets go to school together. 咱们一起上学去
7、吧。咱们一起上学去吧。 Let him not go. 别让他走。别让他走。(6) 在请求、命令和口号中，常用无动词在请求、命令和口号中，常用无动词祈使句，它实际上是省略了动词，从而祈使句，它实际上是省略了动词，从而使句子更简洁有力。如：使句子更简洁有力。如： Just a minute, please! 请稍等！请稍等！口口 诀诀 下面的口诀总结了祈使句的一般规律。下面的口诀总结了祈使句的一般规律。一起来看看吧一起来看看吧! 祈使句祈使句, 有特点有特点, 动词原形摆在前动词原形摆在前, 否定句式也不难否定句式也不难, Dont 放在最前面放在最前面, 其它一律都不变。其它一律都不变。 Lo
8、ok at the signs and write the rules.Dont touch.No photos.No smoking.No entry.What does each sign mean? Write the rules.Dont drink the water.No parking.No fire.No food and drinks.1. Its an important meeting. _ (not, be) late.2. _ (not, make) any noise! Your mother is sleeping.3. _ (not, speak) with y
9、our mouth full of food.4. _ (not, talk) and _ (read) aloud.Dont beDont makeDont speakDont talkreadFill in the blanks.5. _ (not, leave) your homework for tomorrow, Larry.6. _ (look) out! A car is coming.7. _ (give) us ten years and just see what our country will be like.8. _ (not, let) the baby cry.D
10、ont leaveLook Give Dont let1. _ play in the street. Its very dangerous A. Do B. Not C Dont D. Doesnt2. Dont _ late again. A. are B. be C. is D. amCBChoose the correct answers.3. - Sorry for being late again. - _ here on time next time, or youll be punished. A. Be B. Being C. To be D. Been4. Please _
11、 because this is a reading room. A. quiet B. to be quiet C. to quiet D. be quiet AD1. 咱们一起玩吧！咱们一起玩吧！ 2. 请不要迟到。请不要迟到。 3. 回答这个问题。回答这个问题。 4. 不要这么吵。不要这么吵。 Lets play together.Dont be late, please.Answer the question.Dont be so noisy. / Dont make so much noise.Translate these sentences.5. 上课安静。上课安静。 6. 不要
12、随处乱扔垃圾。不要随处乱扔垃圾。 7. 不打架不骂人。不打架不骂人。 8. 有事请假。有事请假。 9. 友好待同学。友好待同学。 Be quiet in class.Dont throw rubbish everywhere.Dont fight or say rude words.Ask for leave.Be friendly to classmates. 1. If you want answers to all your questions about science, this is the right place for you.2. If you want to fill a
13、bag with sand, you have to control a kind of truck on wheels.3. If you compare the medicine of the past with the medicine of today, you will feel very lucky next time you visit a doctor!Read the sentences below.Have a good rest if you are tired. 如果累了，你就好好休息一下。如果累了，你就好好休息一下。 If you have time, please
14、come with me. 如果你有时间，请跟我来。如果你有时间，请跟我来。 这是这是“if 从句从句+祈使句祈使句”的句子结构，的句子结构， if 从句用一般现从句用一般现 在时态。在时态。if引导的条件句既可以放在句子前，引导的条件句既可以放在句子前， 也可也可以放在句子后。以放在句子后。 从句位于主句之前时，从句位于主句之前时，常用逗号将其与主句隔开。常用逗号将其与主句隔开。1. If you _ (want) to see old machines, _(go) to the museum.2. If you _ (visit) London, _ (take) a boat trip
15、 on the river.3. If the computer does not _ (start) immediately, _ (wait) for one minute.4. If the weather _ (get) colder, _ (put) on warm clothes.wantgoComplete the sentences with the correct form of the words in brackets.visittakestartwaitgetsput5. If any student _ (have) a high fever, _ (send) hi
16、m / her to the school doctor at once.6. If you _ (want) to know how it works, _ (read) the book.hassendwantread1. If you do not like the TV programme, _.turn off the TV / change the channel Complete the sentences.2. If you want to know where you are, _.ask the police for help Complete the sentences.
17、3. If you cannot arrive at the station on time, _.wait for the next train Complete the sentences.4. If you need to send an email, _.turn on the computerComplete the sentences.5. If you want to go, please _.Complete the sentences.call6. If you want to go skating, _.Complete the sentences.wear warm cl
18、othes7. If you visit a museum, _.Complete the sentences.not shout,not run(2010重庆中考重庆中考) Work hard, _ you may catch up with your classmates soon. A. or B. but C. and D. yet解析：本句是解析：本句是“祈使句祈使句and”的句型，句的句型，句意为意为“努力学习，你会很快赶上其他同学努力学习，你会很快赶上其他同学的的”，and在句中表示承接关系，所以选在句中表示承接关系，所以选C项。项。Choose the correct answ
19、ers.(2009哈尔滨中考哈尔滨中考) Boys and girls, _ up your hands if you want to take part in the summer camp (夏令营夏令营). A. putting B. to put C. put解析：由关键信息解析：由关键信息Boys and girls和题意可和题意可知这里要用祈使句，应以动词原形开头，知这里要用祈使句，应以动词原形开头，故正确答案为故正确答案为C。(2008芜湖中考芜湖中考) _ this kind of peach, and you will like it.A. To try B. Trying
20、C. Try D. Tried解析：解析： 答案为答案为C。Read and finish the exercise.The Palace MuseumName British MuseumNew York MuseumCountryChinaThe UKThe USAAddressChangan StreetNew Oxford Street, LondonChestnut Street, New YorkFeatureThe largest ancient palace buildings with many kinds of collections in ChinaOne of the
21、largest museums with collections of any time and any area in the worldAmericas largest museum on American historyTicket￥60 ( Spring/Summer)￥40 (Autumn/Winter)freeMonday free1. As one of the largest museums in the world, British Museum is in _. A. Beijing B. London C. New York D. the USA2. New York M
22、useum is Americas largest museum on American _. A. area B. history C. collections D. buildings3. The Palace Museum, which is in the center of Beijing, is also called “Forbidden City in China”. It lies in _. A. Changan Street B. New Oxford Street C. Beiling D. Chestnut StreetBBA4. According to the fo
23、rm, if you want to see ancient Chinese collections, you can visit _ at most. A. one museum B. two museums C. three museums D. fore museums5. Which of the following is TRUE?A. Each ticket for the Palace Museum costs the same in the whole year.B. You dont have to pay for tickets if you visit New York Museum on Monday.C. British Museum lies in Chestnut Street, London.D. New York Museum is the largest in the world.BB