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Unit 4Dont eat in class.Section A(3a-3c) 肯定祈使句 否定祈使句1. Sit down.2. Come in.3. Eat at home.4. Listen to music outside.5. Do your homework at school.Dont sit down.Dont come in .Dont eat at home.Dont listen to music outside.Dont do your homework at school.Examples 祈使句1.祈使句是表示命令、叮嘱、号召等的句子;2.通常省略主语you;3.句中谓语动词用动词原形;4.祈使句有肯定和否定两种： Dont eat in class.Come in, please! 请进！ Sit down, please. 请坐。 Dont play sports in the classroom.Dont fight .否定肯定 Do you know the rules in these places? hospital meeting room gas station 3a Write the rules for the school library. Library Rules1. _2. _3. _4. _Dont talk.Dont eat in the library.Dont listen to music in the library.Dont take pictures/photos in the library. 3b Use the words to make questions about the rules. Then write answers according to your school.Be quiet?Q: _ (she/have to/ in the library)?A: _Eat?Q: _(he/have to/in the dining hall)?A: _Does she have to be quiet in the library?Yes, she does.Does he have to eat in the dining hall?Yes, he does. Listen to music?Q: _ (we/can/ in the hallways)?A: _Wear a hat?Q: _(we/can/in the classroom)?A: _Can we wear a hat in the classroom?No, we cant.Can we listen to music in the hallways?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!We can walk out of the class anytime we want.We can wear what we want.We may have less homework and more free time. can 能，能够 （表示许可） Can I sit here? No, you cant. 我可以坐这儿吗？ 不, 你不能。can 能，会 （表示能力） Can you play basketball? Yes, I can. 你会打篮球吗？ 是的, 我会。 have to dont / doesnt have to必须，不得不不必 你不必在上午七点前到校。 You dont have to be school before 7:00. 他们在学校必须做什么呢？ What do they have to do at school？ 我们要保持安静。 We have to be quiet. 根据句意，用can和cant填空。1. Mr G reen_ smoke here because theres a sign on the wall. It says “No smoking.”2. Its very hot outside. You_ wear a hat.3. We _ eat in the classroom because its impolite to teachers.4. I _ go to bed after 11:00 on school night.5. The students _ read books and magazines in the library.cant cancant cancant 用have to或has to填空。1.We _ clean our classroom after school.2.She _ make her bed after getting up. 3.Its late. Mr Beckman _ go to work by car.4.Emily and Peter join a music club. They _ practice the guitar every day.have tohave to has to has to Talk about your school day. What can you do and what do you have to do? Then make a list. Lets talk according to the list.Can we eat in the hallway?Yes, we can. / No, we cant.Do we have to wear a uniform?Yes, we do. / No, we dont.
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