Unit 2 Topic 3Section D课件仁爱版英语八年级上册.pptx
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1、Topic 3 Must we exercise to prevent the flu?Section D,Unit 2 Keep Healthy,Language goals,By the end of the class, you will be able to1.Master the following words ,phrases and sentences:Words & phrases: stretch, equipment, choose, instead, instead of2. Master the usage of must & have to.3. Use Reflex
2、ive Pronouns,Quick mind,n. 设备,器材,equipment,adv. 代替,反面,instead,v. 选择;挑选,choose,n. 经理,活力,energy,另一方面,on the other hand,代替,instead of,Should we need to warm up before running?Yes, we should.,Ask and answer,Is it necessary for us to buy good exercise equipment?No, it isnt.,Should we spend a lot of time
3、exercising?No, we shouldnt.,Modal Verbs (): must/have to,Must,have to,neednt,must,have to,Grammar,情态动词 must与 have tomust 和 have to 用作情态动词,都有“必须”的含义,两者有时可以互换使用。不过两者也各有其“独特”之处。使用场合不同:must 表示主观上认为有义务、责任而“必须”做的事,是说话人的主观看法;也用于肯定的推测,意为“一定,必定”。而 have to 则强调由于客观原因而不得不做某事,是客观上的“必须”,常译为“不得不”。e.g. 1. I must go
4、 home now.我现在必须回家了。2. You must be hungry after the long walk.走了这么长的路,你一定饿了。3. My mother is ill, so I have to go now.我妈妈病了,所以我现在不得不走了。,人称和时态的变化不同:must 没有人称和时态变化;而 have to 有人称、时态变化,在一般现在时中,第三人称单数用 has to,其它人称用 have to,一般过去时中用 had to。e.g. 1. Lucy must go to bed before 11.露西必须 11 点前睡觉。2. He has to stay
5、in bed for 3 or 4 days becauseof his illness.因为他的病,他不得不卧床 3 到 4 天。,疑问句的答语不同:对 must 开头的一般疑问句作肯定回答时用 must,否定回答则用 neednt 或 dont /doesnt have to;包含 have to 的句子变为一般疑问句或否定句,要根据句中时态由助动词 do的相应形式来构成。肯定、否定回答也要借助助动词 do 的相应形式来完成。e.g. 1. Must I return the book today?我必须今天还书吗? No, you neednt. You can do it tomorr
6、ow.不,你不必。你可以明天还。 Yes, you must.是的,你必须今天还。,2. Does she have to have piano lessons everyweekend?她每周末都得上钢琴课吗? Yes, she does.是,她每周末都得上钢琴课。 No, she doesnt.不,她没必要每周末都上钢琴课。注:must 的否定形式 mustnt 表示“不许,禁止”。,Do,have,No I dont,doesnt have,No you neednt,No you dont have to,had better not,Reflexive Pronouns,Person
7、,Number,myself,yourselves,herself,themselves,Grammar,1.用适当的反身代词填空。 I cooked _ a meal and then I watched TV. If you dont help him, hell have to do it all by _. I put the food on the table and asked them to help _. Jack and Peter, did you clean the room _? Be careful with that knife or youll cut _. Jo
8、hn hurt _ when he was playing football.,myself,himself,themselves,yourselves,yourself,himself,May,ahead,busy,like,leave,not to forget,say,up,Functions,The more exercise, the better. ( )We should stop exercising when we are hurt. ( )Drinking while playing sports is bad for our health. ( )Exercising i
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