Unit 13 Section A (Grammar Focus-4c)(课件PPT)-【优翼·学练优】2021-2022学年九年级下册初三英语（人教版）

九年级（下） Go for it! 优翼英语教学课件 Section A (Grammar Focus-4c) 优翼九年级英语下（RJ） 教学课件 Unit 13 We’re trying to save the earth! 学习目标 Key words & phrases: take part in ,afford, turn off, reusable, pay for, take action, transportation Key sentences: 1.Have you ever taken part in an environmental project? 2. We should help save the sharks. To review different tenses and voices. Revision Retell the passage about sharks in 3a What's the sharks' problem? Why are they endangered? Some facts and numbers about sharks at present How to save the sharks Reason: Comment: Shark fin soup: What people do: Result: Sharks’ situation: Environmental protection groups (Wild Aid & WWF): scientific studies: at the top of food chain, ecosystem, numbers drop, bring danger to... popular, southern China catch, cut off, throw… back into ... without, can no longer swim, slowly dies not only cruel , but also harmful to be endangered, although… ② numbers, have fallen, 90%, in the last 20 to 30 years. ② teach … about … ① ask...to...laws to stop… ①70 million,are caught, traded, industry No…, show…, be good for... Presentation Grammar Focus We’re trying to save the earth. Present progressive The river used to be so clean. used to The air is badly polluted. Passive voice No scientific studies have shown that shark fins are good for health. Present perfect We should help save the sharks. Modal verbs Grammar 现在进行时 现在进行时 基本 结构 基本 用法 标志词 be (am/is/are) + 动词-ing 1.表示现在正在进行或发生的动作。 2.表示现阶段或当前一段时间之内 正在进行的动作。 now、look、listen、these days等 a.一般情况下，在动词词尾后加-ing。 如：go → going。 b.以不发音的e结尾的动词，去掉e加-ing。 如：have → having。 c.以重读闭音节结尾的动词，末尾只有一个辅音字母，双写这个辅音字母，再加-ing。 如：run → running。 动词-ing形式的构成 现在完成时 现在完成时 基本 结构 基本 用法 标志词 have/has + 过去分词 1. 表示过去发生或已经完成的动作对现在造成的影响或结果。 2. 从过去某一时间开始并一直持续到现在且还有可能持续下去的动作。 already、yet、ever、never、for +时间段、since +时间点、so far、in the last/past...years等 过去分词的构成 一般情况下，在动词后加-ed。如: work → worked。 在以e结尾的动词后只加-d。如: close → closed。 以辅音字母加y结尾的动词，应将y改为i再加-ed。如: study → s