Unit 5 Languages around the world Period Three　Discovering Useful Structures 课件（共62张）+学案（含答案）+练习（含答案

Period Three　Discovering Useful Structures 【语境感悟】 阅读以下有关“语言学习”的短文,感知加黑部分,并回答其后的问题。 Language is a powerful tool. There are many reasons ①why we learn different languages. We often study languages in countries ②where English is the main language. The time ③when we start learning a language can affect our learning results. If we begin early, we may learn better. In the process of learning, we talk to teachers ④with whom we practise speaking and improve our skills. Also, there are many platforms ⑤on which we can find useful learning materials. By using these resources and working hard, we can master languages well. 【自主归纳】 以上语段中,句①②③④⑤均为定语从句,why,where,when为关系　　　　;with whom和on which均为“介词+关系　　　�———�。句①中,why在定语从句中作　　　　,从句修饰表示　　　　的名词reasons;句②中,where 在定语从句中作　　　　,从句修饰表示　　　　的名词countries;句③中,when在定语从句中作　　　　 ,从句修饰表示　　　　的名词time;句④中,whom指代表示　　　　的名词teachers;句⑤中,which指代表示　　　　的名词platforms。 定语从句之关系副词 定语从句除了由关系代词引导外,还可由关系副词when, where, why引导,它们在从句中作状语。 一、基本用法 1.关系副词when引导的定语从句 当定语从句所修饰的先行词是表示时间的名词,且在定语从句中充当时间状语时,用when引导,也可以用“介词+which”来代替when。如: I will never forget the day when/on which an earthquake struck Wenchuan, Sichuan Province. 我永远也不会忘记四川省汶川县发生地震的那一天。 2.关系副词where引导的定语从句 当定语从句所修饰的先行词是表示地点的名词,且在定语从句中充当地点状语时,用where引导定语从句,也可以用“介词+which”来代替where。如: The house where/in which I lived ten years ago has been pulled down. 我10年前居住的那所房子已经被拆了。 3.关系副词why引导的定语从句 当先行词是reason且从句缺少状语时,用why引导定语从句,相当于for which。如: The reason why/for which I was late was that my car broke down on the way. 我迟到的原因是我的汽车在路上抛锚了。 4.如果定语从句前面的先行词是activity, case, point, event, situation, job, organisation, position等抽象名词,且在从句中作状语时,应用where来引导定语从句。如: ①Let’s think of a situation where the idiom can be used properly. 让我们想出一个可以正确使用该习语的情况。 ②Today, we’ll discuss a number of cases where beginners of English fail to use the language properly. 今天,我们将讨论许多关于英语初学者对英语使用不当的情况。 二、关系代词和关系副词的区别 选用关系代词还是关系副词,归根结底要看定语从句缺什么成分。如果缺的是主语、宾语或定语,就用关系代词;如果缺状语,则用关系副词。 1.先行词是地点。如: ①The mountain village where I stayed for a night last year has taken on a new look. 我去年住过一晚的那个山村的面貌焕然一新了。(从句缺状语,故用where) ②The mountain village (which/that) I visited last year has taken on a new look. 我去年参观过的那个山村的面貌焕然一新了。(从句缺宾语,故用which/that或省略) 2.先行词是时间。如: ①I will never forget the days when I lived in the countryside with the farmers. 我永远不会忘记我和农民们住在农村的日子。 ... ...