Unit1FoodforthoughtUsinglanguage课件- 高中英语外研版（2019）必修第二册.pptx

Period 2 Using languages 1. To learn the grammar about Modal verbs. 2. To do some exercises to practice them.Learning aimsa .I was able to hold a knife and fork - and chopsticks!b But there are still some dishes that Dad dare not try even after many years of marriage to my mother. c .Mum and I just have to find a way to get him into the kitchen!d .wed better not eat too much roast food as it may make us suffer from heat inside our bodies, .e “ You neednt try it if you dont want to,” Mum said,.Look at the sentences from the reading passage. Think and work out the meanings of the words underlined.Whats the meaning of the words underlined?Modal Modal verbsverbs( (情态动词情态动词) ) can be used to express the speakers meaning of possibility, permission, obligation and advice, ability, etc.be afraid to do somethinghave the ability to do somethingbe necessary or give strong advice to do somethinggive advice to do or not to do somethingnot be necessary to do somethingNow lets focus on more examples.Leading-in情态动词情态动词(Modal verbs)表示说话人的某种语气或者情绪，如可能，表示说话人的某种语气或者情绪，如可能，意愿，猜测，义务，需要等意愿，猜测，义务，需要等。1. 基本特征：基本特征：(1)情态动词不能单独做谓语，后面接情态动词不能单独做谓语，后面接动词原形动词原形；(2)情态动词情态动词没有人称和数的变化没有人称和数的变化（be able to，have to除外）除外）Grammar Modal verbs(1)2. 基本用法：基本用法：be able todareneedhave tohad better1. a) be able to 后接动词原形，表示后接动词原形，表示某人做某事的能力某人做某事的能力，可可用于大多数时态用于大多数时态。They were able to escape from the building when the fire broke out.火灾发生时，他们设法从那栋建筑里逃了出去。火灾发生时，他们设法从那栋建筑里逃了出去。 b) be able to 用于用于过去时态过去时态时，可以表示时，可以表示 “某人过去或当某人过去或当时成功地做了某事时成功地做了某事”。c) can与与be able to can只有现在时和过去时只有现在时和过去时(could)，而，而be able to则有更多则有更多的时态变化。的时态变化。 can一般指一般指自身具有的能力自身具有的能力，而，而be able to则表示则表示经过一经过一段时间的努力后所具有的能力段时间的努力后所具有的能力，相当于，相当于manage to do或或succeed in doing。【即学【即学即练即练】选词填空选词填空 (can/be able to)(1)He might fix your car.(2)When I was young, I climb any tree in the woods.(3)In todays information age, the loss of data cause serious problems for a company.(4)Father spent hours talking to him. At last he drop the silly idea.be able to couldcanwas able to 2. a) dare 作作情态动词情态动词时，时， 主要用于主要用于否定句否定句、疑问句疑问句和条件从句和条件从句中，一般不用在肯定句中。中，一般不用在肯定句中。 Im so afraid that I dare not move.我吓得一动也不敢动。我吓得一动也不敢动。 Dare she ring him at the office?她敢打电话到办公室找他吗？她敢打电话到办公室找他吗？ 2. b) need 表示表示 “需要需要”或或 “必须必须”, 作作情态动词情态动词时，用于时，用于否定否定句和疑问句句和疑问句中，在肯定句中一般用中，在肯定句中一般用must, have to, ought to或或should 代替。代替。neednt表示表示“不必；不需要不必；不需要”。You neednt tell him about it. He has known it.你不必告诉他这件事。他已经知道了你不必告诉他这件事。他已经知道了。 2. c) dare 和和need 常用作常用作实义动词实义动词，有，有时态、人时态、人称和数的变化称和数的变化。所不同的是，作。所不同的是，作实义动词实义动词时，时，在在肯定句肯定句中，中，dare+带带to的不定式的不定式；在；在否定句和否定句和疑问句疑问句中，中，dare+带带to/不带不带to的不定式的不定式。 I dare to swim across this river. 我敢游过河去。我敢游过河去。 He didnt dare (to) say what he thought. 他不敢说出他的想法。他不敢说出他的想法。 He does not dare (to) answer. 他不敢回答。他不敢回答。 【即学【即学即练即练】完成句子完成句子1.I _ the wood at night.夜间我不敢在小树林里走。2.Does he _ what he has done?他敢告诉你们他所做的事情吗？3.Theres plenty of time.You _.时间很充足，你不必开这么快。一句多译一句多译4.这辆自行车需要修理。The bike needs repairing.The bike _.dare (to) tell youneednt drive so fastdare not walk throughneeds to be repaired3. a) have to 的含义与的含义与must相似，两者往往可相似，两者往往可以互换使用，但以互换使用，但have to 有各种时态有各种时态，且，且强调强调客观需要客观需要，意为，意为 “不得不不得不”。 Its dark now. I have to go home. 现在天黑了现在天黑了，我必须回家我必须回家。 I have to leave because of the bad weather. 因为天气不好，我不得不离开了。因为天气不好，我不得不离开了。 Do you have to wear uniforms at school? 你在学校必须穿校服吗？你在学校必须穿校服吗？ You dont have to/neednt go if you dont want to.如果你不想去，就不必去。如果你不想去，就不必去。 3. b) 否定形式是否定形式是dont have to，相当于，相当于neednt。【即学【即学即练即练】完成句子完成句子1.I here because I have no umbrella with me. 我不得不在这儿等，因为我没带伞。我不得不在这儿等，因为我没带伞。2.You smoke here. 这儿禁止吸烟这儿禁止吸烟3.We hurry, for theres plenty of time. 我们不必着急，因为时间很充裕。我们不必着急，因为时间很充裕。4. She by 11 oclock.她她必须在必须在11点以前到家。点以前到家。 have to wait mustntdont have to must be home 4. had better 后接动词原形，意为后接动词原形，意为 “最好最好”, 用用于于现在或将来时现在或将来时，可用于，可用于一切人称，没有任何一切人称，没有任何词形变化词形变化。 had better 的否定式是在其后加的否定式是在其后加not,疑问式是把疑问式是把had和和not 提前。提前。 Youd better sit here and have a rest. 你最好坐在这儿休息一下。你最好坐在这儿休息一下。 She had better not tell lies any more. 她最好再也别撒谎了。她最好再也别撒谎了。 Hadnt the doctor better see him? 医生是不是去看看他比较好？医生是不是去看看他比较好？ 【即学即练】完成句子（完成句子（had better）1. I think you had better go to the doctor（最好去找医生看看）（最好去找医生看看） about your cough.2. We had better leave now（最好现在就走）（最好现在就走） or well miss the bus.3.Before getting the drivers license, you had better not drive（最好不要驾（最好不要驾驶）驶） the car on the road.had better go to the doctorhad better leave nowhad better not driveSummary. 选词填空选词填空Exercise1. As there was no bus，we_ (had to；should) walk home.2. I want to go to the office，but you _(need not to go；need not go) with me.3. The manager is so hottempered that I dare not _(to tell；tell) him the bad news.4. You neednt _(to fetch；fetch) four；two will do.5. I have no bike，so I _(have to go；must go) to the office on foot.had toneed not gotellfetchhave to go6. You _(neednt buy；neednt have bought) a gift，but you can if you want to.7. I talked with her for a long time，and eventually I _(could；was able to) make her believe me.8. The patient _(can be operated on；has been able to be operated on) by the end of this month.neednt buywas able tocan be operated on. 完成句子完成句子1. I will _ in three years.三年后我将能讲英语。2. Im afraid you _such a thing.恐怕你不敢做这样的事。3. Do I _my telephone number and address?我有必要把电话和地址留下吗？4. Given his health condition，we _.考虑到他的身体状况，我们最好不要让他去那里了。5. It was raining outside；we _.外面在下雨，我们不得不待在家里。be able to speak Englishdare not/darent doneed to leavehad better not let him go therehad to stay at home