1、Dont eat in class.Unit 4第二课时：第二课时：Section A(Grammar Focus-3c)Our school is very big and beautiful，and there are a lot of rules helping us to study better.Can you tell me the rules in the school?Look at the picture to talk about what you have to/must/cant do.Grammar FocusDont run in the hallways.Dont
2、 fight.What are the rules?We must be on time for class.Can we eat in the classroom?No,we cant,but we can eat in the dining hall.Can we wear a hat in class?Yes,we can./No,we cant.Does he have to wear a uniform at school?Yes,he does./No,he doesnt.What do you have to do?We have to be quiet in the libra
3、ry.语法讲解语法讲解祈使句祈使句 用于表达命令、请求、劝告、警告、禁止等的句子叫做祈使句。祈使句最常用于表达命令。祈使句因对象(即主语)是第二人称，所以通常都省略主语。祈使句的开头动词都为原形，句末则使用句号或叹号。eg:Go and wash your hands.去洗你的手。(命令)Be quiet,please.请安静。(请求)Be kind to your sisters.对妹妹要和善。(劝告)Look out!Danger!小心！危险！(警告)Keep off the grass.勿践踏草坪。(禁止)Do型动词原形(宾语)其他成分Please have a seat here.请这
4、边坐。Be型Be表语(名词或形容词)其他成分Be a good boy!要做一个好孩子！Let型Let宾语动词原形其他成分Let me help you.让我来帮你。考点考点 祈使句的形式祈使句的形式考向一考向一 肯定祈使句的形式：肯定祈使句的形式：_dressed now!We have to go in ten minutes.OK,Mom.(济南)A.Getting B.Get C.To get D.Gets典例典例B考向二考向二否定祈使句的表现形式：否定祈使句的表现形式：Do型在句首加DontDont forget me!不要忘记我！Be型Dont be late!不要迟到！Let型D
5、ontlet宾语动词原形其他成分Dont let him go.=Let him not go.别让他走。Let宾语not动词原形其他成分No 型 No+动词的-ing 形式！No fishing!禁止垂钓！典例典例1 1Daniel,_ play with the mobile phone while youre walking in the street.(盐城)A.dont B.doesnt C.wont D.cantA典例典例2 2Which sign of the following means“No smoking”?(宿迁)魔法魔法记忆记忆祈使句用法歌诀祈使句用法歌诀祈使句，祈使
6、句，请求、命令或建议。主语是you常省去，动词原形开头记。否定形式要注意，句首要把Dont立。要讲客气用please，句首、句末没关系。No doing!需提起，表示“禁止”不小觑。考点考点1 1 have to 的用法的用法考向一考向一have to 后跟动词原形，后跟动词原形，意为意为“必须做必须做；不得不做不得不做”。情态动词情态动词have to和和musthave to 表示客观需要做的事情，意思是表示客观需要做的事情，意思是“必须；必须；不得不不得不”。eg:Its raining,and you have to bring an umbrella.下雨了，你必须带把伞。考向二考向
7、二have to 有人称和数的变化，其第三人称单数形有人称和数的变化，其第三人称单数形式为式为has to。eg:She has to look after her younger brother.她不得不照看她的弟弟。考向二考向二 含有含有have/has to 的句子要借助于助动词的句子要借助于助动词do/does 以及以及dont/doesnt 构成一般疑问句或否定句。构成一般疑问句或否定句。eg:Do they have to do the work?他们必须做这项工作吗？He doesnt have to go home now.他不必现在就回家。典例典例 You _ take me
8、 to the station.My brothers taking me.(江西)A.cant B.mustnt C.shouldnt D.dont have toD考点考点2 2 must 的用法的用法考向一考向一 must 为情态动词，意为为情态动词，意为“必须，一定必须，一定”。情态。情态动词不能单独作谓语动词，必须和动词原形一动词不能单独作谓语动词，必须和动词原形一起构成谓语部分。起构成谓语部分。eg:You must read a book before you watch TV.在看电视前你必须读书。典例典例I _ go now,or Ill miss my train.(北京)
9、A.can B.might C.must D.couldC考向二考向二 must 用于否定句时，用于否定句时，mustnt 意为意为“不允许，不允许，禁止禁止”，而不表示，而不表示“不必不必”。eg:You mustnt be late for school.你千万不要上学迟到。典例典例 Hurry up,Mom!The bus is coming.Wait a minute,dear.You_ cross the road until the traffic lights turn green.(丹东)A.must B.need C.mustnt D.needntC考向三考向三 以以must
10、 开头的一般疑问句，若作否定回答，可开头的一般疑问句，若作否定回答，可以用以用neednt 或或dont have to，不用，不用mustnt。eg:Must I clean all the rooms?我必须打扫所有的房间吗？No,you neednt/dont have to.不，你不必。典例典例 Must I hand in(上交)my homework now,Mr.Smith?No,you _.(北京)A.cant B.shouldnt C.wouldnt D.needntD考向四考向四 辨析：辨析：have to 与与musthave to 强调客观存在的必强调客观存在的必要性，
11、含有不情愿的色要性，含有不情愿的色彩，不能用来表示推测。彩，不能用来表示推测。must 表示说话人的主观表示说话人的主观意志和看法，含有自觉、意志和看法，含有自觉、自愿的色彩。自愿的色彩。I have to study hard 我不得不努力学习I must study hard 我必须努力学习3aLibrary Rules1.Dont talk.2._3._4._Write the rules for the school library.Dont eat in the library.Dont listen to music.Dont take photos._3bUse the word
12、s to make questions about the rules.Then write answers according to your school.Be quiet?Q:Does she have to be quiet in the library?(she/have to/in the library)?A:Yes,she does.Eat?Q:_ (he/have to/in the dining hall)?A:_Listen to music?Q:_ (we/can/in the hallways)?A:_Does he have to eat in the dining
13、 hall?Yes,he does.Can we listen to music in the hallways?No,we cant.Wear a hat?Q:_ (we/can/in the classroom)?A:_Can we wear a hat in the classroom?Yes,we can.3c 1.We can eat in class.2.We dont have to come to school every day.3.At my dream school,we dont have to come to school every day.We.Make up f
14、ive cool rules for your dream school.Share your rules with the class.Your classmatesvote for the Coolest School!单项选择单项选择1._on the TV,Jim.Id like to watch the evening news.OK,Dad.(济南)A.Turn B.Turns C.Turning D.To turnA2.Please _ your exam papers once again before handing them in.(上海)A.going over B.we
15、nt over C.go over D.to go over3.Lets _chess.Good idea!A.play B.to play C.playing D.playedCA4.Lets _a noise.Someone is sleeping.(齐齐哈尔)A.not make B.no making C.not to makeAD【点拨点拨】用用语境判定法语境判定法解题。由后一句解题。由后一句“有人在睡觉。有人在睡觉。”可知要求对方可知要求对方“不要制造不要制造”噪音；噪音；let sb.not do sth.是固定是固定结构，故选结构，故选A。5._on the grass,or
16、it will“cry”.(陕西)A.To walk B.Not to walk C.Walk D.Dont walk6.All the students_ know cheating in the exam is not allowed.(十堰)A.need B.may C.must D.can7.Excuse me,sir.Visiting hours are over.You_leave.Pardon me,nurse.I didnt hear the bell.(东营)A.may B.can C.must D.needCC8.Must I do the dishes now?No,yo
17、u_.(新疆)A.mustnt B.neednt C.may not D.cantBD【点拨点拨】mustnt 禁止；禁止；neednt 没必要；没必要；may not 不可不可以；以；cant 不可能。以不可能。以must 引导的疑问句否定回答用引导的疑问句否定回答用neednt，意为，意为“没必要没必要”。故选。故选B。9.She doesnt have to _the dishes.A.washing B.washes C.to wash D.wash10.Bob cant go hiking with us because he_ help with the housework at home.A.have to B.has to C.must not D.shouldntB【点拨点拨】鲍勃不能去远足是因为鲍勃不能去远足是因为“不得不不得不”在家帮忙做在家帮忙做家务，此处指客观上的需要，且主语是第三人称单数，家务，此处指客观上的需要，且主语是第三人称单数，故选故选B。本节课主要听写了单词，学习了语法：本节课主要听写了单词，学习了语法：祈使句情态动词祈使句情态动词have to 和和must的用法，的用法，并做了相应的练习加以巩固。并做了相应的练习加以巩固。
