Unit 1 Honesty and responsibility Grammar and usage 课件-2023-2024学年高中英语牛津译林版（2020）选择性必修第四册

Unit 1 Honesty and responsibility Grammar and usage 语法感悟 请认真阅读下列句子，感悟体会其句子结构。 1.You can only imagine how travelers felt when they saw the oasis of Dunhuang ahead of them. 2.If you look up，you can see the paintings and other artworks that are testimony to how the Silk Road brought East and West together. 3.Come a little bit closer so that you can get a better view. 4.The Apsaras are depicted sailing in the bright blue sky，with their scarves flying，as if they are about to fly down to meet us. 5.Move over here where you can see it in more detail. 6.He was so discouraged that he gave up this project in the end. 7.In the Ming Dynasty，trade routes changed and Dunhuang was not as prosperous as it used to be. 8.Gradually，it faded from memory，even though it was once such a great city. 9.Given that the theme of the Expo was to promote cultural exchange and strengthen mutual cooperation between the countries along the Silk Road，Dunhuang was the ideal place. 10.He went to a big city because he wanted to make his fortune. [自主发现] 以上例句中，句 是条件状语从句； 句 是时间状语从句； 句 是地点状语从句； 句 是原因状语从句； 句 是目的状语从句； 句 是方式状语从句； 句 是结果状语从句； 句 是让步状语从句； 句 是比较状语从句。 2、9 1 5 10 3 4 6 8 7 语法精讲 [用法图解] [用法详解] 一、定义 1.状语定义：状语是用来修饰谓语、形容词或副词，或是整个句子的成分。 2.状语从句：当充当状语的部分是一个句子时，该句子就是状语从句。 二、状语从句的分类 (一)时间状语从句 1.when，while和as引导的时间状语从句 连词 含义及用法 例句 when “当……时候”，可与延续性动词或短暂性动词连用；从句动作可以发生在主句动作之前、之后或与主句动作同时发生 When you apply for a job，you must present your application.当你申请工作时，你必须递交你的申请表。 while “当……时候”，一般只可与延续性动词连用，从句动作与主句动作同时发生 When/While the teacher paraphrased the text in English，the students listened attentively and took notes.当老师用英语解释课文时，学生们聚精会神地听并做着笔记。 as “随着……”，“一边……一边……”，常与延续性动词连用，从句动作与主句动作同时或几乎同时发生 As it gets warmer and warmer，the trees begin to come to life. 随着天气越来越暖和，树木开始有了生机。 2.before和since引导的时间状语从句 连词 词义 常用句式 before 在……之前； 还没有来得及……就……； 趁着……； ……才…… ①It will be/was＋一段时间＋before... 要过/过了……时间才…… ②It won’t be＋一段时间＋before...过不了多久就会…… ③It wasn’t＋一段时间＋before...没过多久就……了 since