高中英语教学课件：Unit 2 wb using structure1.pptx

Using Structurebe being done At present various wild animals are being protected\are under protection in the wetland.These years our schoolis being built more and more beautiful.At the moment I am being surrounded by lovely you ,a group of excellent youths who are always being praised by people around. The present continuous passive voice1. 形式: 肯定句：am/is/are + being + v-ed 否定句：am/is/are + not + being + v-ed 一般疑问：Am/Is/Are + 主语 + being + v-ed +其他？ 特殊疑问句：疑问词 + am/is/are + being+ v-ed？ 疑问词 + am/is/are + 主语 +being + v-ed + 其他？2. 意义:表示说话时或现阶段正在进行或发生的被动动作，强调 主语是动作的承受者。3. 用法：(1)表示此刻正在进行的被动动作，句中常有 now, at the moment,at present ,look 等时间状语或标志词 。(2)表示现阶段正在持续的动作,句中常有these days,these years, nowadays等时间状语或标志词 。(3)一种习惯的被动行为，常与 always, often, constantly 等频度副词连用，常有赞赏或讨厌等感情色彩。。 Challenging situation about wildlife protection: The balance of nature on our plant ________ (threaten)as a large number of species _________(drive)to extinction. Some scientists predict that half of all our plants and animals will be extinct by 2100. The question is why these species__________(endanger). One of the main reasons is loss of habitat. Animal habitats __________(destroy)as humans search for more natural resources to consume(消费). More land ___________(also use) for growing crops or keeping livestock(家畜). In addition , massive amounts of waste __________(produce)by humans, which are polluting animal habitats. Harmful chemicals _____(create)by human activities are being released into the air, water, and soil. The whole of nature ___________(affect)by human beings. However, much has been done and __________(still do)to save endangered species. Many programmes ___________(design)to preserve the populations of endangered species. In my opinion , there is still hope that humans can live in harmony with all things on the earth.1. What are other reasons why these species are being endangered? 2.Actually,what