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1、UnitUnit 3 3 LanguageLanguage inin useuse导学目标：导学目标： 1. 掌握情态动词 must, can, could 表推测。 2. 掌握祈使句的用法。 自主预习：自主预习： 一、根据句意及首字母补全单词1. K_ money in a safe place. 2. We played basketball i_ because it rained. 3. Ill hear a footstep on the s_. 4. Earthquake is very c_ in Japan. 5. Many earthquakes can cause a lo
2、t of d_. 6. They c_ people from the beach. 二、选用方框中的介词完成句子1. People are trying to clear the rocks _ the roads. 2. She learnt _ underwater earthquake. 3. They cleared people _ the beach just minutes before a huge wave reached the land. 4. I met my friend Tom _ my way home. 5. Our parents are proud _ u
3、s. 6. A ten-year-old girl saved about one hundred other tourists in 2004_ warning them that a huge ocean wave was coming across the sea. 课堂导学：课堂导学： 1. 情态动词 must, can, could 表示推测情态动词情态动词 can,can, couldcould 表示表示“能够，可以能够，可以”等意义等意义,can,can, couldcould 还表示对现在或将来的推还表示对现在或将来的推 测。意为测。意为“会，可能会，可能” 。 （1）canc
4、an 表示推测时表示推测时，往往用于否定句和疑问句。用于疑问句时，can 比 could 表示的 “可能性”要大；用于否定句时，cant 表示“不可能” 。 例如：You cant be serious! 你不是认真的吧！ （2）couldcould 则可用于肯定句、否定句和疑问句，表示某事有可能发生或可能是事实则可用于肯定句、否定句和疑问句，表示某事有可能发生或可能是事实 例如: He could be in pain. 他可能很疼。Can/Could this be true? 这有可能是真的吗？ （3）情态动词情态动词 mustmust 也可以表示猜测，意思为也可以表示猜测，意思为“一定
5、、准是一定、准是” ，通常只能用于肯定句。 例如：Betty, you must know! 贝蒂，你肯定知道！ 辨析： （1）Who sent the present? Can it be your brother?是谁送来的礼物啊？会是你哥哥 吗？（询问可能性） （2）It must be your brother. 肯定是你哥哥。 （语气强烈，表示非常肯定） （3）It cant be my brother. His still in France. 不可能是我哥哥，他还在法国。 （表示不肯能） 2. 祈使句祈使句 表达说话人对对方的叮嘱、劝告、希望、禁止、建议、请求或命令等。祈使句on
6、, by, about, from, of, off一般以动词原形开头，无时态和数的变化。常见的句型如下： 1.1. 动词原形构成的祈使句动词原形构成的祈使句此类祈使句暗含的主语是 you, 但通常省略。祈使句的句首或句末有时加 please, 还可 以加上称呼语，用逗号与句子主体隔开。例如： Have a nice day!祝你度过美好的一天！ Come this way, please. 请走这边。 Please be quiet, boys! 男孩们，请安静！ Make sure hes warm. 确保他不受凉。 祈使句否定形式往往在句首加上祈使句否定形式往往在句首加上 dodo no
7、tnot (dont(dont ) ) 或或 nevernever。例如： Dont use the lift. 不要使用电梯。 Never be late again! 再也不要迟到了！ 2.2. letslets 构成的祈使句构成的祈使句这类祈使句往往用于提出建议，例如： Lets spend this weekend in the countryside. 这周我们到乡下度周末吧。 祈使句否定形式是当祈使句表示邀请或建议(Lets) 时，则在在 LetsLets 与与 dodo 之间加之间加 notnot。 例如：Lets not hurry. 我们不要太急。 3.3. 无动词祈使句无动
8、词祈使句 在请求、命令和口号中，常用无动词祈使句，它实际上是省略了动词，从而使祈使句更简 洁有力。 例如：Just a minute, please! 请稍等！This way, please! 请走这边！ 祈使句否定形式是句首加祈使句否定形式是句首加 not.not. 例如：Not there! 不是那儿! 当堂达标：当堂达标： 单项选择（语法专练）( )1. - Look at the boy running on the ground . Is it Davis? - It _ be him. I saw him go to the teachers office just now. A
9、. must B. cant C. could D. might ( )2. Her doctor said, “ _ work so hard” A. Stop B. Dont C. Cant D. No ( )3. _ in bed. Its bad for your eyes. A. Not to read B. Dont read C. Dont to read D. Not read ( )4. _ when you cross the road. A. Do care B. Care C. Be careful D. To be careful ( )5. _ your child
10、. Well look after him. A. Not to worry about B. Dont worry about C. Not worry for D. Dont worry with ( )6. Do you believe what he says? Yes，it _ be true.A. can B. could C. need D. has to ( )7. The book on the teachers desk _yours. Your name seems to be on it. A. maybe B. must be C. may is D. has to
11、be ( )8. Li Ying _ be here now as she went to Beijing three days ago. A cant B neednt C mustnt D may not( )9. -The lake is said to be dry. Is that true? -It _.Look, some kids are swimming in it. A. must be true. B. cant be true C. may not be true D. can be true ( )10. -David, is that man your head t
12、eacher?-It _ be him. Hes the tallest in our school.A. mustnt B. cant C. neednt D. wont 课后提高：课后提高： 一、用所给单词的适当形式填空1. The earth can rise and fall beneath the building without _ (shake) it. 2. _(luck), my mum was at home. 3. People must stay inside to keep away from _ ( fall ) rocks. 4. Do you keep them
13、 _(warmly). 5. Dont move them to a _(comfortably) place。 二、根据要求完成句子 1. The government is warning people about an earthquake. (划线部分提问)_ _ the government _? 2. The children didnt go to the playground because it rained. (同义句转换)The children didnt go to the playground _ _ rain. 3. There is something wron
14、g with the radio. (改为否定句) There _ _ wrong with the radio. 4. She went to London by air yesterday. （划线部分提问） _ _ she _ to London yesterday？ 5. Lets go swimming.(改为否定句)Lets _ _ swimming. 四. 阅读理解When some plates of the earth move suddenly, an earthquake happens. Many earthquakes begin under the sea. Earthquakes may happen anywhere on the earth. They often happen near the mountains.During an earthquake, the shakings make rocks rise suddenly and even crack (断裂) open. Houses fall, people are killed or hurt, and sometimes the whole villages or cities
