Unit 2 Section Ⅲ　Discovering Useful Structures （ppt课件）-2022新人教版（2019）《高中英语》必修第二册.pptx

1、英 语Section Discovering Useful Structures词汇认知词汇认知汉译英汉译英1.deer n.鹿鹿 2.kangaroo n.袋鼠袋鼠 3.insect n.昆虫昆虫 n.网网adj.净得的净得的;纯的纯的 5.neighbourhood n.临近的地方临近的地方;街区街区 6.due to 由于由于;因为因为 词汇拓展词汇拓展7.reduce vt.减少减少reduction n.减少减少 语法图解语法图解现在进行时的被动现在进行时的被动语态语态 探究发现探究发现阅读下列句子阅读下列句子,注意句中的画线部分注意句中的画线部分1.The car is being

2、 cleaned.2.The window of her room is often being broken.3.Some animals are not being protected well enough.4.Is this bridge being built now?5.How many trees are being cut down right now?现在进行时的被动语态由现在进行时的被动语态由be+being+及物动词的及物动词的过过去分词去分词构成构成,助动词助动词be有人称和数的变化有人称和数的变化,即即am,is,are。现。现在进行时与在进行时与often等频率副词

3、连用时等频率副词连用时,不表示动作正在进行。不表示动作正在进行。词汇精讲词汇精讲【教材原文】【教材原文】It is reported that living spaces for wildlife are(reduced/being reduced)due to the cutting of trees.(Page 18)据报道据报道,野生动物的生存空间因为砍伐树木而减少了野生动物的生存空间因为砍伐树木而减少了/正在正在减少减少。考点考点一一reduce vt.减少减少;缩小缩小(尺寸、数量、价格等尺寸、数量、价格等)reduce sth from.to.从从减少减少/降低到降低到reduce

4、 sth by.把把减少减少/降低了降低了reduce sth to sth 将将概括为概括为(或简化为或简化为)reduction n.减少减少;缩小缩小;降低降低语境领悟语境领悟(1)The number of employees was reduced from 40 to 25.雇员人数从雇员人数从40 减少到了减少到了25。(2)Costs have been reduced by 20%over the past year.过去一年过去一年,各项费用已经减少了各项费用已经减少了20%。(3)There has been some reduction in unemployment.

5、失业人数有所减少。失业人数有所减少。考点考点二二due adj.由于由于;因为因为 due to 由于由于;因为因为due adj.到期的到期的;预期的预期的be due to do sth 预期做某事预期做某事语境领悟语境领悟(1)Please make sure you return the book before its due.请确保在到期前还书。请确保在到期前还书。(2)She is due to complete her study and graduate this June.她将于今年她将于今年6月份完成学业月份完成学业,并毕业。并毕业。(3)He will make a go

6、od reporter due to his language skills.由于他的语言技能由于他的语言技能,他会成为一个好记者的。他会成为一个好记者的。学以致用学以致用单句语法填空单句语法填空(1)The price of the shirt was reduced from$50 to$35 in the sale.(2)We can reduce the problem to two main issues.(3)There is a slight reduction(reduce)in costs,so it is possible that well make more profi

7、ts this year.完成句子完成句子(4)下一辆公共汽车将在半个小时以后到达。下一辆公共汽车将在半个小时以后到达。The next bus is due to arrive in half an hour.(5)他们因为糟糕的天气来晚了。他们因为糟糕的天气来晚了。They came late due to the bad weather.语法精析语法精析现在进行时的被动语态现在进行时的被动语态一、用法一、用法1.现在进行时的被动语态表示说话时正在进行的一个被动现在进行时的被动语态表示说话时正在进行的一个被动的动作的动作,强调主语是动作的承受者。强调主语是动作的承受者。Look!The c

8、hildren are being taken care of by their aunt.看看!孩子们正由他们的姑妈照看着。孩子们正由他们的姑妈照看着。2.现在进行时的被动语态也可表示目前这一阶段正在进行现在进行时的被动语态也可表示目前这一阶段正在进行的一个被动的动作。的一个被动的动作。Many nature reserves are being set up these days.如今有许多自然保护区正在建设中。如今有许多自然保护区正在建设中。3.现在进行时的被动语态表示一种习惯的被动行为现在进行时的被动语态表示一种习惯的被动行为,常与常与always,often,constantly,f

9、requently等表示频度的副词连用等表示频度的副词连用,常常有赞赏或讨厌等感情色彩。有赞赏或讨厌等感情色彩。The same questions are always being asked.总有人问同样的问题。总有人问同样的问题。二、二、构成构成 肯定式肯定式am/is/are+being done否定式否定式am/is/are+not+being done一般疑问式一般疑问式Am/Is/Are+主语主语+being done?特殊疑问式特殊疑问式特殊疑问词特殊疑问词+am/is/are+主语主语+being done?三、注意事项三、注意事项“be+under/in/on+名词名词”结

10、构也可表示现在进行时的被动语结构也可表示现在进行时的被动语态的含义。态的含义。Paper money is still in use.纸币仍然在流通。纸币仍然在流通。The problem is under discussion.这个问题正在被讨论。这个问题正在被讨论。即学即练即学即练单句语法填空单句语法填空(1)We cant use the computer because it is being repaired(repair).句型转换句型转换(2)The milu deer is under attack now.The milu deer is being attacked now.(3)The exhibits are being shown in the museum.The exhibits are on show in the museum.