Unit4SectionA(GrammarFocus－3c)课件 人教版英语七年级下册.pptx

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1、Section A(Grammar Focus3c)Unit 4Dont eat in class.情情 景景 导导 入入Please take out a piece of paper and write down some school rules.Then make some new school rules or class rules.Then lets discuss your school rules，which is good，and which we should change？We cant run in the hallway.What are the rules in

2、our school?We have to wear uniforms to school.And what eles?Dont run in the hallways.Dont 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.Grammar FocusDoes he have to wear

3、 a uniform at school?Yes,he does./No,he doesnt.What do you have to do?We have to be quiet in the library.Grammar Focus祈使句一般用来表示请求、命令、劝说、号祈使句一般用来表示请求、命令、劝说、号召、警告等。在祈使句中，通常省略主语召、警告等。在祈使句中，通常省略主语you，其，其肯定形式以动词原形开头，否定形式是肯定形式以动词原形开头，否定形式是在动词原形前加在动词原形前加dont。祈使句句尾用句号或。祈使句句尾用句号或感叹号，读时用降调。为表示礼貌，可以在感叹号，读时用降调。

4、为表示礼貌，可以在句首或句尾加上句首或句尾加上please。句末用句末用please时时，前，前面通常面通常加逗号加逗号。祈使句祈使句 肯定句：动词原形肯定句：动词原形(+宾语宾语)+其他其他.否定句：否定句：Dont+动词原形动词原形(+宾语宾语)+其他其他.Wear the school uniform on weekdays,please.上学上学日请穿校服。日请穿校服。Dont watch TV before dinner.晚饭前不要看电视。晚饭前不要看电视。Do 型祈使句的构成型祈使句的构成 肯定句：肯定句：Be+表语表语+其他其他.否定句：否定句：Dont+be+表语表语+其他其他

5、.Be careful next time.下次要细心。下次要细心。Dont be late for school!上学不要迟到上学不要迟到!Be 型祈使句的构成型祈使句的构成 肯定句：肯定句：Let+宾语宾语+动词原形动词原形+其他其他.否定句：否定句：Dont+let+宾语宾语+动词原形动词原形+其他其他.或或Let+宾语宾语+not+动词原形动词原形+其他其他.Lets have a rest.咱们休息一下吧。咱们休息一下吧。Dont let him go swimming.=Let him not go swimming.不要不要让他去游泳。让他去游泳。Let 型祈使句的构成型祈使句的

6、构成(1)No+v-ing!/No+名词名词!No fishing!禁止钓鱼禁止钓鱼!No parking!禁止停车禁止停车!No photos!禁止拍照禁止拍照!(2)never 代替代替dont 来加强语气。来加强语气。Never give up!决不放弃决不放弃!其他类型的否定祈使句其他类型的否定祈使句情态动词情态动词have to与与mustu共同点共同点二者二者均可表示均可表示“必须必须”，其后均接动词原形。，其后均接动词原形。Its too late.I have to take a taxi.太晚了，我必须乘出租车。太晚了，我必须乘出租车。I must go now.我必须现在就

7、走。我必须现在就走。u不同点不同点 have to强调因客观因素影响而不得不做某事，跟主观意愿无强调因客观因素影响而不得不做某事，跟主观意愿无关，关，通常上下文中会有暗示客观因素的句子，多译为通常上下文中会有暗示客观因素的句子，多译为“不得不不得不”。可用于不同的时态，有人称和数的变化，其一般现在可用于不同的时态，有人称和数的变化，其一般现在时的第三人称单数形式为时的第三人称单数形式为has to；过去式为；过去式为had to。have to的否定形式为的否定形式为dont/doesnt/didnt have to，表，表示示“不必不必”。must表示因主观需要或责任感的驱使而有必要或义务去

8、做表示因主观需要或责任感的驱使而有必要或义务去做某事，多译为某事，多译为“必须必须”。一般只用来表示现在，没有人称和数的变化。一般只用来表示现在，没有人称和数的变化。must的否定形式为的否定形式为mustnt，表示，表示“禁止，不准禁止，不准”。3a Write the rules for the school library.Library Rules1._2._3._4._Dont talk.1234Dont eat in the library.Dont listen to music in the library.Dont take photos in the library.3b

9、Use the words to make questions about the rules.Then write answers according to your school.Q:_(she/have to/in the library)?A:_.Be quiet?Does she have to be quiet in the library?Yes,she doesEat?Q:_(he/have to/in the dining hall)?A:_Does he have to eat in the dinning hall?Yes,he does.Q:_(we/can/in th

10、e hallways)?A:_Listen to music?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?No,we cant.3c Make up five cool rules for your dream school.Share your rules with the class.Your classmates vote for the Coolest School!1.We

11、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 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

12、 uniforms at school.For example问问 题题 探探 究究must和和have to的用法的用法(1)你不得不穿校服吗你不得不穿校服吗？Do you have to wear the school uniform?(2)我我现在必须要走吗现在必须要走吗？Must I go now?不不，你不必，你不必。No，you neednt.2.Can we bring music players to school？我们我们可以把音乐唱片机带到学校吗？可以把音乐唱片机带到学校吗？课课 堂堂 小小 结结Section A(Grammar Focus3c)Important phr

13、asesin classwear a uniformbe quietImportant sentences1Can we wear a hat in class?Yes，we can./No，we cant.2Does he have to wear a uniform at school?Yes，he does./No，he doesnt.随随 堂堂 练练 习习.根据句意，用方框中所给词组的适当形式填空。根据句意，用方框中所给词组的适当形式填空。1.You should _The baby is sleeping.2.She likes _ on school days.3.We cant

14、listen to music _in class，on time，have to，wear a uniform，be quietbe quietwearing a uniformin class4.Can I finish my homework tomorrow?I am afraid not.You _ hand it in today.5.You cant arrive late for class.You must be _in class，on time，have to，wear a uniform，be quiethave toon time1.David,_ make trou

15、ble at school.A.cant B.dont C.doesnt D.didnt2.Mom,can I play computer games this evening?_ your homework first,and then well talk about it.A.Finishing B.Finish C.To finish D.Finished3.Buses _ stop when the traffic lights turn red.A.can B.may C.must D.mightBBC.单项单项选择。选择。4.We should keep quiet in the library.We _ speak loudly （大声地）大声地）.A.must B.mustnt C.can D.neednt5.I _ go now,or Ill miss my train.A.can B.might C.must D.could 6.He _ stay at home,because its raining outside.A.have to B.has to C.must D.cantBCB