Unit 2 Discover useful structures ppt课件（含音视频素材）-（2022新）人教版高中英语高二选择性必修第三册.rar

1、I.Choose the best answer. 1. Its our duty _ the room every day. A. to clean B. cleaned C. clean D. cleans2. Its hard for us _ English well. A. learn B. learns C. to learn D. learning3. Its very nice _ you to get me two tickets _ the World Cup. A. for, of B. of, for C. to, for D. of, to4. 建造这座立交桥将花费工

2、人们一年多的时间。 It will _ the workers over a year _ the flyover.用用 it 作形式主语改写句子。作形式主语改写句子。1. To have a good knowledge of history is very helpful for all of us.2. To learn a foreign language is very useful for a scientist.3. To finish this work in three hours is necessary. . Translation. 1. 早起是必要的。2. 对我们来说

3、，完成这项工作很困难。3. 如何控制水污染是一个大问题。4. 步行去那儿要花费我们很长时间。Unit 2 Learning About LanguageDiscover useful structuressurgeonsurgeryliberationshaveshave offdisturbcigarettespecialistconsultantdrugskipn. 外科医生n. 外科手术；外科学n. 解放；摆脱vt.,vi&n. 剃（须发）；刮脸剃掉；刮去vt. 打扰；搅乱；使烦恼n. 香烟；卷烟n. 专科医生；专家n. 顾问；高级顾问医师n. 毒品；药物vt. 跳过;不参加；悄悄溜走v

4、i. 蹦蹦跳跳地走；跳绳n. 蹦跳Read after the tape and speak out the Chinese immediately.review:翻译：1. 中世纪时期，西方艺术的目的是教人们基督教方面的知识。During the Middle Ages , the purpose of Western art is _ people about Christianity.不定式作表语2. 杨利伟是中国第一个进入太空的宇航员。Yang Liwei is the first Chinese astranaut _into space.不定式作定语t o teach t o go

5、 1. To change bad habits is never easy. 改变坏习惯绝不容易。2. It took the surgeon three hours to finish my mothers lung surgery.花了这位外科医生三个小时完成我妈妈的肺部外科手术。3. To join the Peoples Liberation Army, it is required for men to shave off their beards.为了加入中国人民解放军，男性需要刮掉他们的胡子。4. It was not polite to disturb your neighb

6、ours with loud music last night.昨晚上用大声的音乐打扰你的邻居是不礼貌的。What do these sentences have in common ?翻译句子：这些不定式短语在句中都作主语这些不定式短语在句中都作主语. .动词不定式作主语动词不定式作主语Focus on 基本用法不定式作主语一、通常用法二、*it作形式主语的用法 *it作形式主语时的三 种情况三、“疑问词+动词不定式” 作主语的用法To obey law is everyones duty. 遵纪守法是每个人的职责。 To talk with your mouth full is rude.

7、 满嘴食物讲话是不礼貌的。动词不定式作主语不定式作主语通常位于句首。Observe these sentences and think about what it refers to.it为形式主语动词不定式为真正的主语见优化学案P29：当句子的主语是动词不定式短语时，为避免头重脚轻，一般用代词 it 作形式主语放在句首，而将真正的主语动词不定式短语放在句末。it作形式主语时有三种情况：1. 常用形容词作它的表语。真正主语不定式通常有逻辑主语，一般用for短语来表示，即It is +adj. + for sb. to do sth. (其中sb.就是to do的逻辑主语)。Its import

8、ant for us to keep the water clean.保持水质清洁对我们来说是很重要的。当表语形容词表示不定式的逻辑主语的性质或特征时，则不用for，而用of，即It is +adj. +of sb. to do sth.Its very kind of you to say so.你这样说真是太好了。2.有时也接名词作表语：It is +n.+ to do sth. It must be great fun to fly to the moon in a spaceship.乘宇宙飞船飞往月球一定很有趣。3. it作形式主语时，还常用于 “It takes(took /wil

9、l take) sb. some time/money to do sth.” 句型中。It took me more than an hour to do my homework yesterday evening.昨天晚上我做作业用了一个多小时。注意：疑问词 how, what, when, where, which+不定式短语作主语可置于句首。 How to use the computer is the question如何使用计算机是个问题。 Where to go has not been decided去哪儿还没有定下来。1. important / avoid / passiv

10、e cigarette smoking2. will take / nutrition specialist / a balanced diet menu / make / an hour / for you3. useful / turn to / fitness consultant / for advice4. illegal / dangerous / take drugs5. harmful / skip breakfast / oftenP17 2Join the words to make full sentences. Join the sentences to make a

11、paragraph. You can add your own sentences if necessary to make your paragraph more meaningful.It is important to avoid passive cigarette smoking.It will take an hour for a nutrition specialist to make a balanced diet menu for you.It is useful to turn to a fitness consultant for advice.It is dangerou

12、s to take illegal drugs.It is harmful to skip breakfast (too) often.1 A: Hello, doctor. I want to lose weight, but I just cant seem to do it. What can you do to help me? B: Well, first, its necessary to _what you eat. Cut out all fatty food and sugary drinks, and eat more fruit and vegetables.2. A:I

13、 really need to _ a way to exercise more. I could use a fitness app, but my phones full. B: So delete a few files. Im sure the app doesnt take up much space.3. A: Before exercising, always do a few warm-ups to_. B: I know. But then I always feel too tired to continue!4. A:Should I go for the pizza o

14、r the fried chicken? I hate _ like these. You know what - Im going to eat both! B:Wow! Dont eat too much junk food - youll get fat. Ive actually _ to go on a diet, so Ill just stick to the fruit salad.P17 3begin with, be in control of, make a choice, decide on, make up ones minddecide on be in contr

15、ol of making choicesbegin withmade up my mindComplete the conversations with the correct forms of the phrases in the box.*通常位于句首；*常用it作形式主语的句型结构： It is +adj. + for sb. to do sth. It is +adj. +of sb. to do sth. It is +n.+to do sth. It takes(took /will take) sb. some time/money to do sth.”*“疑问词+动词不定式”

16、作主语动词不定式作主语：I.Choose the best answer.1. Its our duty _ the room every day. A. to clean B. cleaned C. clean D. cleans2. Its hard for us _ English well. A. learn B. learns C. to learn D. learning3. Its very nice _ you to get me two tickets _ the World Cup. A. for, of B. of, for C. to, for D. of, to4.

17、建造这座立交桥将花费工人们一年多的时间。 It will _ the workers over a year _ the flyover. taketo build 1. To have a good knowledge of history is very helpful for all of us.2. To learn a foreign language is very useful for a scientist.3. To finish this work in three hours is necessary. It is very helpful for all of us t

18、o have a good knowledge of history.It is very useful for a scientist to learn a foreign language.It is necessary to finish this work in three hours.用it作形式主语改写句子。. Translation.1. 早起是必要的。2. 对我们来说，完成这项工作很困难。3. 如何控制水污染是一个大问题。4. 步行去那儿要花费我们很长时间。Its difficult for us to finish the work.How to control the water pollution is a big problem.It will take us a long time to walk there.To get up early is necessary.各个击破1. Can you tell the usage of the infinitive as the subject?2. Can you use the infinitive as the subject correctly?Self-evaluationSelf-evaluationFinish the exercises in Learning English.