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1、Unit 4 Dont eat in classGrammar Focus3cObjectives1.To learn to talk about library rules.2.To learn to use have to/must,can and can t.3.To learn to use Imperatives sentences.Grammar 祈使句(imperative Sentence)imperative 1.概念：祈使句一般用来表示请求、命令、劝说、号召、警告等。2.用法：在祈使句中，通常省略第二人称主语 you。肯定式以动词原形开头，否定式一般在动词原形前加dont。
2、3.句末标点符号：用感叹号或句号。4.语调：读降调。GrammarCome in,please!Sit down,please.Be quiet,please.Don t eat in class.Don t play sports in the classroom.Dont fight.各种情感的祈使句Turn off the TV,please.请关上电视请求请求Go and wash your hands.去洗手一命令命令Let s play basketball.我们去打篮球吧建议建议Be kind to your classmates.对同学要友好叮嘱叮嘱Have a good da
3、y!过个愉快的一天祝愿祝愿No smoking!禁止吸烟禁止禁止注意事项有时可在祈使句的句首或句尾加上 please,使语气显得客气、有礼貌。如 果在句尾加please,应该用逗号与前句 隔开。e.g.Go this way,please.请这边走。注意事项“No+名词/动词ing形式”表示禁止或规 劝，常用于公共场所。e.g.No photos!No smoking!禁止拍照！禁止吸烟!Never give up!决不放弃!（never代替don t来加强语气）Grammar Focus阅读Grammar Focus部分，完成下列句子。We must be on time for class
4、.Don t run in the hallways.1.不要在楼道里跑。2.不要打架。3.有什么规矩？4.我们必须按时上课。Don t fightWhat are the rules?5.我们可以在教室里吃东西吗？6.不能。但我们可以在餐厅里吃东西。7.我们可以在上课的时候带帽子吗？Can we eat in the classroom?No,we can t,but we can eat in the dining hall.Can we wear a hat in class?8.他在学校里必须穿校服吗？Does he have to wear a uniform at school?9
5、.是的，必须。/不，不必。Yesf he does./Nof he doesn7 t.10.你们必须做什么？Whadoou have to do?_11.在图书馆里我们必须保持安静。We have to be quiet in the library.1.情态动词must的用法(1)表示因主观需要或责任感的驱使而有必要和义务去做某事，意思是必须、应该。一般只用来 表示现在，没有人称和数的变化不能单独使用，必须与其后的动词原形构成谓语。句型结构：主语+must+动词原形+其他.例：你必须做你的作业。You must do your homework.(2)表示有很大把握的判断或者推测，意思是“一
6、定、准是”例:那个高个子男人一定是你的爸爸。The tall man must be your father.以must开头的一般疑问句的肯定回答用must,否定回答用needn t或者 don t/doesn t have to(不必)。Must I leave now?我现在必须离开吗？Yes，you must/No，you needn t(don t have to)是的你必须。或不，你不必 mustnt常用于否定句中，表示“不允许，禁止”例:你的车不允许停在这儿You mustnt park your car here.情态动词 have to的用法have to表示必须,强调客观需要
7、，有不得不、被逼无奈做某事的意思1.have to后接动词原形,例:我不得不离开了.I have to leave2.第三人称单数形式为hasnt。.此词既有人称单复数的变化，也有动词时态的变化。3.其否定形式和疑问句形式均需要借助助动词do和does才可以进行变化。have to的句型结构：肯定句：主语+have/has/had to+V原形+其他.否定句：主语+don t/doesn t/didn t havent+V原形+其他.疑问句：Do/Does/Did+主语+have to+V原形+其他?情态动词must与have to的不同点We must help others when th
8、ey are in trouble.当别人有困难时我们必须要懵助他们（责任感的驱使）He has to stay here because it s raining 因为下雨，他不得不呆在这。（受客观因素的影响）Library Rules1.Dont talk.2.Don t listen to music.3.Don t eat or drink.4.Don t take photos.Write the rules for the school library.3a方法指导：1.由图示可知都是一些禁止类的祈使句。2.可知应用“Dont+动词原形”句子。3bUse the words to
9、make questions about the rules.Then writeanswers according to your school.1.根据例句，可知要求我们造 1.Be quiet?(she/have to/in the library)Q:Does she have to be quiet in the library?A:Yes,she does.2.Eat?(he/have to/in the dining hall)Q:_?A:_3.Listen to music?(we/can/in the hallways)Q:_?A:_4.Wear a hat?(we/can/
10、in the classroom)Q:_?A:_ 一般疑问句并根据实际情况进 行回答。2.先确定句子的主语。3.再确定用情态动词还是用助 动词来构成疑问语序。4.根据实际情况做出肯定或否 定回答，答语的主语要与问句 保持一致。Make up five cool rules for your dream school.Share your rules with the class.Your classmates vote for the coolestSchool!ReportWhose school is the coolest?Great!Jim s school is the cooles
11、t.At my dream school,we dont have to come to school every day.We can eat in the classroom.We can listen to music in class.We dont have to do homework.We dont have to wear school uniforms at school.无规矩，不成方圆No rules,no standards.HomeworkDo you have family rules?What can you do?What can t you do?And what do you have to do at home?Please write out your family rules.