Unit 5 Using Language知识点(ppt课件)-2022新人教版（2019）《高中英语》选择性必修第一册.pptx

1、选修一选修一 Unit 5Using language知识点讲解知识点讲解词汇精讲词汇精讲句型剖析句型剖析1.【教材原文】【教材原文】They may look beautiful on the outside,but inside there is usually more water than essential minerals,and they often have less flavour as well.(Page 55)它们可能外表看起来很漂亮它们可能外表看起来很漂亮,但里面通常有更多的水但里面通常有更多的水,而不而不是必需的矿物质是必需的矿物质,而且它们的味道通常也更差。而且它

2、们的味道通常也更差。词汇精讲词汇精讲句型剖析句型剖析考点考点essential adj.完全必要的完全必要的;极其重要的极其重要的be essential to/for 对对很重要很重要It is essential that.(should)do.做做是完全必要的。是完全必要的。It is essential for sb to do.对对某人来说做某人来说做是完全必要的。是完全必要的。词汇精讲词汇精讲句型剖析句型剖析学以致用学以致用单句语法填空单句语法填空(1)When we learn a language,it is essential for us to write(write)co

3、mpositions.(2)Sun and water are essential to/for the growth of crops.(3)It is essential that you(should)learn(learn)Chinese history.词汇精讲词汇精讲句型剖析句型剖析2.【教材原文】【教材原文】As an alternative,some farmers have switched to organic farming,and many customers have turned to organic food when they shop at the local

4、 grocery.(Page 55)作为一种选择作为一种选择,一些农民已经转向有机农业一些农民已经转向有机农业,而且许多顾客而且许多顾客在当地杂货店购物时转向有机食品。在当地杂货店购物时转向有机食品。词汇精讲词汇精讲句型剖析句型剖析考点考点alternative n.可供选择的事物可供选择的事物adj.可供替代的可供替代的;非传统的非传统的an alternative to 的替代品的替代品have no alternative but to do sth 别无选择只好做某事别无选择只好做某事have the alternative of doing sth 有做某事的选择有做某事的选择alt

5、ernatively adv.可供选择地可供选择地词汇精讲词汇精讲句型剖析句型剖析温馨提示温馨提示1.“别无选择只好做别无选择只好做”的其他表达形式还有的其他表达形式还有:have no choice but to do sth;cant do sth but do sth;can do nothing but do sth等。在这些结构中若等。在这些结构中若but之前出现实义动词之前出现实义动词do的某的某种形式种形式,but之后要用省略之后要用省略to的不定式的不定式,否则否则,but之后的之后的to不能不能省略。省略。2.在短语在短语an alternative to中中,to为介词。为

6、介词。词汇精讲词汇精讲句型剖析句型剖析学以致用学以致用 单句单句语法填空语法填空(1)By 1921,however,peanut had become a real alternative to cotton.(2)If he wants to go to Hongkong tonight,he has no alternative but to go(go)by air.(3)The only alternative to contacting(contact)with him is to write to him.(4)We could take the train or alterna

7、tively(alternative)go by car.词汇精讲词汇精讲句型剖析句型剖析3.【教材原文】【教材原文】Organic farmers also plant diverse crops that use different depths of soil to help keep it rich.(Page 56)有机种植的农民也种植不同的农作物有机种植的农民也种植不同的农作物,利用不同深度的土壤利用不同深度的土壤来保持土壤肥沃。来保持土壤肥沃。词汇精讲词汇精讲句型剖析句型剖析考点考点depth n.向下向下(或向里或向里)的距离的距离;深深(度度)in depth 全面全面;深入

8、深入;详细详细at a depth of.在在的深度的深度in the depths of.在在深处深处A is.times the depth of B.A在深度上是在深度上是B的的倍。倍。deep down 在内心深处在内心深处;本质上本质上;实际上实际上deepen vt.加深加深词汇精讲词汇精讲句型剖析句型剖析学以致用学以致用单句语法填空单句语法填空(1)Such creatures have rarely been seen alive by man as they live at a depth of six hundred feet.(2)I was in the depths(

9、deep)of despair when the baby was sick.词汇精讲词汇精讲句型剖析句型剖析4.【教材原文】【教材原文】What other important aspects of agriculture do you want to know about?(Page 58)你还想了解农业的哪些其他重要方面你还想了解农业的哪些其他重要方面?词汇精讲词汇精讲句型剖析句型剖析考点考点aspect n.方面方面;层面层面in an aspect 在一方面在一方面in every aspect 在每个方面在每个方面in many respects 在许多方面在许多方面in all

10、aspects 在各个方面在各个方面from an aspect 从一个方面从一个方面from every aspect 从各个方面从各个方面词汇精讲词汇精讲句型剖析句型剖析学以致用学以致用单句语法填空单句语法填空(1)The book aims to cover all aspects(aspect)of city life.(2)The relations between our two countries have improved markedly in every aspect.(3)Have you thought about the problem from every aspe

11、ct?词汇精讲词汇精讲句型剖析句型剖析1.【教材原文】【教材原文】As for chemical fertilisers,crops grown with them usually grow too fast to be rich in nutrition.(Page 55)至于化肥至于化肥,用它们种植的作物通常长得太快用它们种植的作物通常长得太快,不能提供丰富不能提供丰富的营养。的营养。词汇精讲词汇精讲句型剖析句型剖析句法分析句法分析句中的句中的too fast to be rich in nutrition为为too.to.结构。结构。too.to.意为意为“太太而不能而不能”,表示否定含

12、义。在该结构表示否定含义。在该结构中中,too为副词为副词,修饰形容词或其他副词。修饰形容词或其他副词。to为不定式为不定式,后跟动词后跟动词原形。不定式做结果状语原形。不定式做结果状语,常用主动形式常用主动形式,其逻辑主语有时是其逻辑主语有时是句子的主语句子的主语;若不是若不是,不定式的逻辑主语通常由不定式的逻辑主语通常由for引出。引出。词汇精讲词汇精讲句型剖析句型剖析学以致用学以致用完成句子完成句子(1)我能找到人聊聊天我能找到人聊聊天,太高兴了。太高兴了。I am only too willing to have someone to speak to.(2)我想提醒你们我想提醒你们,

13、无论何时开始学习都不迟。无论何时开始学习都不迟。I want to remind you that its never too late to learn .词汇精讲词汇精讲句型剖析句型剖析句型转换句型转换(3)She was so excited that she couldnt say a word when she heard the news.She was too excited to say a word when she heard the news.词汇精讲词汇精讲句型剖析句型剖析2.【教材原文】【教材原文】Why different crops are grown is be

14、cause they put important minerals back into the ground,making it ready again for the next batch of crops.(Page 56)为什么要种植不同的作物为什么要种植不同的作物,是因为他们把重要的矿物质放回是因为他们把重要的矿物质放回地里地里,让它再次为下一批作物做好准备。让它再次为下一批作物做好准备。词汇精讲词汇精讲句型剖析句型剖析句法分析句法分析 句句中是中是making it ready.动词动词-ing形式短语做结果状语。动形式短语做结果状语。动词词-ing形式短语做结果状语形式短语做结果状

15、语,相当于一个并列谓语相当于一个并列谓语,所表示的所表示的是谓语动词的直接结果是谓语动词的直接结果,是意料中的结果。是意料中的结果。动词动词-ing形式短语做结果状语时常用逗号与主句隔开形式短语做结果状语时常用逗号与主句隔开,表表示与主句的动作之间有必然的因果关系示与主句的动作之间有必然的因果关系,有时在其前加副词有时在其前加副词thus;动词不定式做结果状语往往表示出乎意料的结果或不动词不定式做结果状语往往表示出乎意料的结果或不好的结果好的结果,而且不定式前常加而且不定式前常加only。词汇精讲词汇精讲句型剖析句型剖析学以致用学以致用完成句子完成句子(1)他跑到火车站他跑到火车站,却发现火车

16、已开走了。却发现火车已开走了。He ran to the station,only to find the train had left.词汇精讲词汇精讲句型剖析句型剖析(2)到到1820年纽约的人口已经增长到了大约年纽约的人口已经增长到了大约125,000人人,结果结果使它成为美国最大的城市。使它成为美国最大的城市。By 1820 the population of New York had grown to about 125,000,making it the largest city in the USA.词汇精讲词汇精讲句型剖析句型剖析句型转换句型转换(3)His parents died early and left him an orphan.His parents died early,leavinghimanorphan.(4)Newly-built wooden cottages line the street,which turns the old town into a dreamland.Newly-built wooden cottages line the street,turning the old town into a dreamland.