Unit 2 Discover useful structures ppt课件-（2022新）人教版高中英语选择性必修第三册.pptx

1、Unit 2Useful StructureLook at the following sentences and pay attention to the italicised infinitives(斜体不定式斜体不定式) ). 1 To change bad habits is never easy.2 It took the surgeon (n.外科医生外科医生) three hours to finish my mothers lung surgery (n. 外科手术外科手术).主语主语主语主语请根据英语句子的基本结构分析请根据英语句子的基本结构分析to do to do 在句子

2、中充当什么成分在句子中充当什么成分S S（主语）（主语）+V(+V(谓语）谓语）+O(+O(宾语）宾语）S S（主语）（主语）+be+P+be+P（表语）（表语）a doctor trained to perform surgery.medical treatment of diseases.句子结构分析：句子结构分析：It takes sb some time to do sth= To do sth takes sb some time. (It 为形式主语，真正的主语为形式主语，真正的主语to do)3 To join the Peoples Liberation (n. 解放解放) A

3、rmy, it is required for men to shave off ( (剃掉剃掉) )their beards(胡须胡须). 目的状语目的状语主语主语正常语序：To shave off beards is required for men to join the Peoples Liberation Army.bdremove4 It was not polite to disturb( (v. 打扰打扰) )your neighbours with loud music last night.主语主语n. anceadj. ed; ingsyn:interrupt正常语序：T

4、o disturb your neighbours with loud music last night was not polite. It is +adj (for sb) to do sth _ to handle plastic is the question.如何如何垃圾分类是个问题。垃圾分类是个问题。 _ to go for dinnerhas not been decided. 去哪儿去哪儿吃饭还没有定下来。吃饭还没有定下来。 HowWhere归纳拓展归纳拓展 疑问词疑问词who, whom, whose, what, which, when, where, how+to do，

5、也可作主语也可作主语。 Join the words to make full sentences1. important / avoid / passive cigarette smoking It is important to avoid passive cigarette smoking. n. 香烟香烟It is +adj (for sb) to do sth 2. will take / nutrition specialist / a balanced diet menu / make / an hour / for youIt will take the nutrition s

6、pecialist an hour to make a balanced diet for you.3. useful / turn to / fitness consultant / for adviceIt is useful to turn to the fitness consultant for advice.n. 专家专家 syn:expert v.ize (in)n. 顾问顾问 person knowing a lot about a subjectIt is +adj (for sb) to do sth It takes sb. some time to do sth.4.

7、illegal / dangerous / take drugs5. harmful / skip breakfast / oftenIt is illegal and dangerous to take drugs.It is harmful to skip breakfast often.n. 毒品，药品毒品，药品It is +adj (for sb) to do sth Complete the conversations with the correct forms of the phrases in the box.1. A: Hello, doctor. I want to los

8、e 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.be in control ofbegin with, be in control of, make a choice, decide on, make up ones mindcontrol2. A: I rea

9、lly 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!decide onbegin withbegin with, be in

10、control of, make a choice, decide on, make up ones mind4. A: Should I go for the pizza or 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.making choicesm

11、ade up my mindbegin with, be in control of, make a choice, decide on, make up ones mindSummarySummary1.1.to doto do作主语作主语，表，表具体的特指待完成具体的特指待完成动作动作, ,谓语用单数谓语用单数（doing作主语常作主语常表习表习惯性惯性动作）动作）To change bad habits is never easy. .2.2.itit作形式主语作形式主语常见于以下情况中常见于以下情况中( (真正的主语真正的主语不定式不定式) )。1) It is + adj. + fo

12、r（表事物特征）（表事物特征）/of（表品质表品质） sb. to do sth.表品德的表品德的a adj:kind,nice,wise,silly等等 表事物特征的表事物特征的adj: easy,hard,difficult,possible2( It is + n. + (for sb.) to do sth. 常见的名词有常见的名词有：pity,shame,pleasure3)It takes/took/will take sb. some time/money to do sth. 3.疑问词疑问词who, whom, whose, what, which, when, where, how+to do，也可作，也可作主语。主语。1. disturb:interrupt n. ance adj. ed (sb); ing (sth)2. specialist (n.) :expert v. ize (in)3. consultant: person knows a lot about a subject consult: go to sb.for advice sb about sth 3. skip: not do sth 不做某事不做某事 ped ( (过去）过去） ping（现在）（现在）