八年级英语上册 Unit 2 Keeping Healthy Topic 3 Must we do exercise to prevent the flu Section C课件2 （新版）仁爱版

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1、UNIT 2 Keeping HealthyTOPIC 3 Must we exercise to prevent the flu?Section CDont eat unhealthy food.Dont smoke.What are the rules?We must be on time for class.What should I do?You need Could I speak to Michael?Yes,you can./No,you cant.Grammar Focus1.祈使句祈使句是表示请求、命令、叮嘱、号召、是表示请求、命令、叮嘱、号召、劝告等的句子劝告等的句子;通常

2、省略主语通常省略主语you;句中谓语句中谓语动词用动词原形动词用动词原形;句尾一般用降调句尾一般用降调;祈使句的祈使句的开头是动词原形开头是动词原形。祈使句有祈使句有肯定肯定和和否定否定两种：两种：e.g.Look out!小心！小心！Wait here for me!在这等我！在这等我！Grammar Come in,please!请进！请进！Sit down,please.请坐。请坐。Lets go home.我们回家吧。我们回家吧。否定否定的祈使句是在动词前的祈使句是在动词前(即句首即句首)加加Dont.e.g.Dont talk in class!不要在课常上讲话！不要在课常上讲话！D

3、ont open the window!别开窗！别开窗！Dont be late for school.上学别迟到上学别迟到!Dont smoking!别吸烟别吸烟!2.情态动词情态动词have to 的用法的用法have to意思是意思是“必须、不得不必须、不得不”,它侧重于客观它侧重于客观上的必要和外界的权威。上的必要和外界的权威。1)结构结构:主语主语have to动词原形其他动词原形其他(一般现在时一般现在时,主语是第三人称单数时主语是第三人称单数时,用用has to;句子是过去时句子是过去时,用用had to。)如：如：2)否定形式否定形式:主语主语dont have to动词原形动

4、词原形其他其他(一般现在时一般现在时,主语是第三人称单数时主语是第三人称单数时,用用doesnt have to;句子是过去时句子是过去时,用用didnt have to)e.g.Nick doesnt have to wear a uniform.尼克不必穿制服。尼克不必穿制服。We didnt have to do our homework at once.我们不必马上完成作业。我们不必马上完成作业。3)疑问句疑问句:Do(Does 或或 Did)主语主语 have to 动词原形其他动词原形其他如如:-Do you have to stay at home on weekends?-Ye

5、s,I do./No,I dont.周末你必须呆在家里吗？周末你必须呆在家里吗？是的是的,我必须。我必须。/不不,我不必。我不必。Did he have to go to bed by 11:00 last night?昨晚昨晚,他不得不他不得不11点前上床睡觉吗？点前上床睡觉吗？1)表示能力表示能力,“会会”,“能能”(在第一册中已经学习在第一册中已经学习这种用法这种用法)例如例如:Can you play the guitar?你会弹吉它吗？你会弹吉它吗？Judy can speak a little Chinese.朱蒂会说一点中文。朱蒂会说一点中文。I can dance and si

6、ng.我能唱歌又能跳舞。我能唱歌又能跳舞。3.情态动词情态动词can的用法的用法3)表示允许、许可表示允许、许可,“可以可以”、“能能”(在这一课在这一课中新学的词义中新学的词义)例如例如:Can the students run in the hallways?学生们可以在走廊上跑吗学生们可以在走廊上跑吗?We can eat outside.我们可以在外面吃东西。我们可以在外面吃东西。Can I come in?我能进来吗我能进来吗?注意注意:同样是情态动词同样是情态动词,can和和have to的用法的用法是有区别的是有区别的,和大部分情态动词一样，和大部分情态动词一样，can在否定句中

7、在否定句中,直接在直接在can后加上后加上not，在疑问句中在疑问句中,把把can放到主语前面，放到主语前面，并且没有人称和数的变化。并且没有人称和数的变化。2.hear,listen和和sound都有都有“听听”的意思，的意思，但三者是有区别的。但三者是有区别的。1)hear“听说听说”,侧重于侧重于“听听”的内容。例如的内容。例如:Im sorry to hear that you are ill.听说你生病了听说你生病了,我很难过。我很难过。I never heard such an interesting story.我从来没听过这么有趣的一个故事。我从来没听过这么有趣的一个故事。2.

8、What else do you have to do?else“其它的其它的”,用来修饰用来修饰something,anything,nothing等等,还可用来修饰疑问词还可用来修饰疑问词 what,where,who等等,else修饰疑问词或不定代词时修饰疑问词或不定代词时,应后置。例如应后置。例如:Do you have anything else to do.Who else did you see?1.Sit down.2.Come in.3.Eat at home.Dont sit down.Dont come in.Dont eat at home.把下列祈使句改成否定句把下列

9、祈使句改成否定句4.Listen to music outside.5.Do your homework at school.Dont listen to music outside.Dont do your homework at school.1.late,dont,for school,arrive 2.music,listen to,in the classroom,dont 3.eat,cant,in the classroom,we Dont arrive late for school.Dont listen to music in the classroom.We cant e

10、at in the classroom.Form sentences.组句组句 4.sports shoes,you,wear,for,gym class,have to5.too,I,many,rules,have,in,my houseYou have to wear sports shoes for gym class.I have many rules in my house,too.用用can和和cant填空填空1.Mr Green _ 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.cantcancancancantThank you!