九年级英语第13单元 第3课时课件.pptVIP

Pay attention to the sentences. 1. We’re trying to save the earth. 2. The river used to be so clean. 3. The air is badly polluted. 4. No scientific studies have shown that shark fins are good for health. 5. We should help save the sharks. used to 结构 used to意为“过去常常做某事”，指的是过去的习惯性动作，目的在于与现在形成对照。used to是个情态动词，其中的to是不定式符号，后面跟动词原形。 He used to stay up late. 他过去常熬到很晚。 Fill in the blanks with the appropriate modal verbs from the box. People _____ think that big things _____ be done. However, many forget that saving the earth begins with small things. For example, you _____ save electricity by turning off the lights when you leave a room. You _____ also use paper or reusable bags instead of plastic bags. Make a list for things that people can do to help the environment and discuss your list with your partner. Discussing... I. 单项选择。 ( )1. We’re trying ______ the earth. A. to save B. saving C. saved D. be saved ( )2. My good friend becomes good at __________English every day. A. speak B. speaking C. speaks D. to speak ( )3. I _________ take dance lessons, but I don’t anymore now. A. used to B. used C. using D. to use to ( )4. It was ________the nicest river in town. A. considering B. considered C. have considered D. to be considered ( )5. When it comes to ________ the earth, people may think that big things should be done. A. save B. be saved C. saved D. saving 1. The air has become really_______ (pollute). 2. Everyone should _______ (play) a part in keeping the city clean. 3. I guess everyone in this city is_______ (try) to improve the environment. 4. You can save electricity by _______ (turn) off the lights when you leave a room. 5. We cannot afford to_______ (wait) any longer before taking action! Section A Grammar focus-4b We’re trying to save the earth. The river used to