Unit 1Discover useful Structures ppt课件-（2019版）新人教版选择性必修第三册高中英语.pptx

1、1. Perhaps the best way to understand Western art is to look at the development of Western painting over the centuries.2. During the Middle Ages, the purpose of Western art was to teach people about Christianity.3. In this work, Monets aim was to convey the light and movement in the scene 4. What th

2、ey attempted to do was no longer show reality, but instead to ask the question, What is art?“5.These books are of great value and they are not to be sold. 讨论归纳讨论归纳： A+be动词动词+(ont)to do B What do these sentences have in common? 动词不定式（短语）作表语相当于名词作表语。它和主语处在同等地位，所指的或是和主语一样的东西，或是主语产生的结果。常常可以将主、表交换位置，句子的意

3、义不变。While-class: Step1 :Definition and functions of Infinitive动词不定式（短语）作表语讨论归纳一：主语是以_ , _ , _ duty, suggestion,duty,hope,idea,intention,plan等为中心的名词词组时，或者以what引导的名词性分句表示，一般用动词不定式作表语说明主语的_ _ _。41. Perhaps the best way to understand Western art is to look at the development of Western painting over the

4、 centuries.2. During the Middle Ages, the purpose of Western art was to teach people about Christianity.3. In this work, Monets aim was to convey the light and movement in the scene 内容讨论归纳二：动词不定式在表语中表示_。5 the purpose of the next stepThe next step is to make sure that you know exactly what is require

5、d.1.I dont know what is to happen to us if we go on like this ?2.The best item on the program is still to come.讨论归纳三： 动词不定式在表语中表示_ _和_ _。=what will happen=will come later6 1.You have done so much.You are to be rewarded . 2.These books are of great value and they are not to be sold.讨论归纳四： 动词不定式用于_ _语

6、态，相当于_ _ _ ,具有情态意义。You should be rewarded.The books should not be sold for their great value.7 1.Who is to blame for the fire. 2.Something is still to find out.讨论归纳五： 动词不定式作表语时，可用_ _形式表示被动意义。81、all作主句主语，其后的定语从句中含有实义动词do的某种形式时。例：All we need to do is live each day with hope.我们需要做的就是带着希望过好每一天。2、what引导的

7、从句作主语，从句中含有实义动词do的某种形式时。例：What I want to do is take a holiday right away.我想马上就去度假。3.（主句）主语被only，first，one，least或形容词最高级修饰，且其后作定语的从句或短语中含有实义动词do的某种形式时。例：In the evening the only thing he did was read the newspaper.晚上他唯一做的就是看报纸。1.动词不定式（短语）和v-ing（短语）作表语时，要注意与句子的主语在形式上保持一致，即若句子的主语为v-ing（短语），则表语也应使用v-ing（短

8、语），若主语为动词不定式（短语），则表语也应使用动词不定式（短语）。例：To see is to believe.= Seeing is believing. 眼见为实。2.动词不定式（短语）和v-ing（短语）作表语时可换用，但以下情况除外：（1）当动词所表达的是某一特定的行为，尤其是将来的行为或有待于实现的行为时，通常用动词不定式（短语）作表语。Her best wish is to put her new ideas into practice.她最大的愿望是将自己的新想法付诸实践。（2）若动词所表达的并不强调动作，而是表示主语的内容，则通常用v-ing（短语）作表语。My favori

9、te sport is swimming.我最喜欢的运动是游泳。1.别担心,你需要做的就是好好睡一觉.Dont worry.What you need to do_ _ _ _ . 2.今年,他的计划是要对教学方法进行一些变革.This year,his plan _ _ _ _ .3.我建议马上开始工作.What I suggest _ _at once. 4.她的爱好之一是集邮.One of her hobbies _ _ _ _ .5.我认为是你弟弟对这次事故负有责任.I think it is your brother who _ _ _ _ .is (to) have a good

10、sleep is to make some changes in the teaching method.is to start workis collecting stampsis to blame for the accident1 The young singers intention of performing the song was2 The best way to do business is3 What the survivors attempted to do was4 The main purpose of art education in schools is5 The

11、aim of the two leaders at the conference was6 For a humble person, one of the hardest things might be7 When you are faced with a serious decision, my suggestion is8 The mother believes her duty is9 All he wanted after a tiring day wasA to build trust between you and your clientB to achieve permanent

12、 peace between their two countriesC to build a memorial to the heroes who saved their livesD to share his love for rock music with his fansE to be left aloneF to criticise other peopleG to inspire students to be creativeH to listen to your own inner voiceI to raise her son to become a man with a nob

13、le mind and a generous heart一、动词不定式（短语）作表语的用法一、动词不定式（短语）作表语的用法1.主语是以aim，suggestion，duty，hope，idea，intention，plan，purpose，the way to do sth等为中心的名词词组时，或者以what引导的名词性分句表示，一般用动词不定式作表语说明主语的内容。2.表示目的。3.表示事态发展的结果、预期的结果、不幸的命运或预言。4.用于被动语态，相当于can/could，should，ought to，must，具有情态意义。5.表示同意、安排、命令、决定、劝告、愿望、意愿、禁止等。6.动词不定式（短语）作表语时，可用主动形式表示被动意义。二、动词不定式（短语）作表语省略二、动词不定式（短语）作表语省略to的情况的情况三、动词不定式（短语）作表语和三、动词不定式（短语）作表语和v-ing（短语）作表语的区别（短语）作表语的区别Homework:Homework:Finish your workbookFinish your workbookP62 Ex1 and Ex 2P62 Ex1 and Ex 2Thank you!