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1、Grammar-4c单元语法单元语法精讲精练精讲精练Unit 8 It must belong to Carla.R 九年级上册Grammar focusWhose volleyball is this?It must be Carlas. she loves volleyball.Whose hair band is this?It could be Meis hair band ,Or it might belong to Linda .They both have long hair.What did you see that night?Im not sure ,but it cant
2、 be a dog. It was bigger. I think it might be a bear or a wolf.情态动词的用法情态动词的用法1 1、掌握情态、掌握情态动词动词的定义:表示可能、怀疑、允诺、的定义:表示可能、怀疑、允诺、愿望、义务、必要、猜测等的愿望、义务、必要、猜测等的动词动词是情态动词。是情态动词。2 2、掌握情态动词的语法特征、掌握情态动词的语法特征1 1) 情态动词不能表示正在发生或已经发生的事情态动词不能表示正在发生或已经发生的事情,只表示期待或估计某事的发生。情,只表示期待或估计某事的发生。2 2) 情态动词情态动词 除除ought ought 和和ha
3、ve have 外,后面只能接外,后面只能接不带不带to to 的不定式。的不定式。3 3) 情态动词没有人称、数的变化,即情态动词情态动词没有人称、数的变化,即情态动词第三人称单数不加第三人称单数不加-s-s。 4 4) 情态动词没有非谓语形式,情态动词没有非谓语形式,即没有不定式、分词等形式。即没有不定式、分词等形式。 can 可表示可表示能力、允许、可能性、怀疑猜测能力、允许、可能性、怀疑猜测,意,意为为“可以,会,能可以,会,能”;cant意为意为“不会,不能,不不会,不能,不可以可以”,还有,还有“不可能不可能”之意。之意。could为为can的过去式的过去式,用法与,用法与can类
4、似,常用于过去时中;类似,常用于过去时中;could还可用于还可用于现在时中现在时中表示委婉客气表示委婉客气,相当于,相当于can;could也可表示也可表示惊讶怀疑,不相信惊讶怀疑,不相信。1can如:如:He couldnt be a thief.2maymay表示允许、也许,意为表示允许、也许,意为“可以,也许,可能可以,也许,可能”。对对may的一般问句的回答:的一般问句的回答:肯定回答一般肯定回答一般是:是:Yes, please./ Certainly./ Sure等等否定回答一般否定回答一般是:是:Please dont./No,you cant/mustnt. might是是m
5、ay的过去式,与的过去式,与may用法类似,常用于过去用法类似,常用于过去时中;用在疑问句中,还可表示委婉客气。时中;用在疑问句中,还可表示委婉客气。3must must 表示必须要做的事,意为表示必须要做的事,意为“必须,应该必须,应该”。must一般问句的一般问句的否定回答用否定回答用neednt或或dont have to,而而不用不用mustnt, mustnt意为意为“不可以,不能不可以,不能”,表禁,表禁止,不许可。另外,止,不许可。另外,must还可表示有把握的推测还可表示有把握的推测,意,意为为“一定、肯定一定、肯定”。must的过去式还是的过去式还是must。 在回答以在回答
6、以must开头的一般疑问句时,否定式需用开头的一般疑问句时,否定式需用need not (neednt),表示,表示“不必不必”的意思。的意思。如:如: Must we hand in our exercises today? Yes, you must. ( No, you neednt) Choose the best way to complete each sentence using the words in brackets. 1. A: Wheres Jean? B: Im not sure. She _ (is / might be / must be) in the labo
7、ratory. 2. A: Everyone is going to the pool after school. B: Really? It _ (must be / cant be / could be) hot outdoors.might be must be4a3. A: Thats the phone. B: Hmm. I wonder who it _ (must be / could be / should be). 4. A: I wonder if these are Jims glasses. B: They _ (cant be / might be / could b
8、e) his. He doesnt wear glasses.5. A: I hear water running in the bathroom. B: It _ (could be / must be / cant be) Carla. She was thinking of taking a shower. could becantmust be Complete these responses.4b Look at this picture of a room. How much can you tell about the person who lives here? Is it a
9、 boy or a girl? What are his / her hobbies? Discuss your ideas with a partner.4c1. I began watching here an hour ago, but now nothing _ yet. A. happened B. will happen C. has happened2.An official _ by some reporters on food problems in Shanghai yesterday. A. is interviewing B. is interviewed C. was interviewed小结训练小结训练3.Tom, _ is ready. I dont want to eat_ ,Mum. Im not feeling well. A. something nice , anything B. nice something, anything C. something nice , nothing 4. It is too _ for us to sleep in the room. A. noise B. noises C. noisy
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