九年级第二单元Unit 2 Topic 3 Section B.ppt

Topic 3 What can we do at home to protect the environment? Section B Unit 2 Saving the Earth What should we do to protect the environment? spread, about We should spread the message about protecting the environment. Brainstorm What should we do to protect the environment? both, sides We should use both sides of paper. What should we do to protect the environment? reuse We should reuse plastic bags. What should we do to protect the environment? collect, waste We should collect waste paper and soft drink cans. protect save After all, we have only one earth! We ought to take actions to protect it! /?k?n/ n. 行动；行为 What else ought we to do? We ought to sort the garbage. /??t/ shut off , electricity We should / ought to shut off the electricity when we leave a room. /,?lektr?s?t?/ n. 电；电能 We ought to ride a bike when we travel a short distance. a short distance /?d?st?ns/ n. 距离 We ought to take a cloth bag when we go shopping. cloth, shopping /kl?θ/ n. 织物，布料 What should you do if you would like to be a greener person? You ought to shut off the electricity. = You should shut off the electricity. ought to 应该 (情态动词) 用法：ought to +动词原形 ought not to + 动词原形或oughtn’t to +动词原形 一般疑问句：ought放句首 Ought I to finish my homework today? 肯：Yes, you ought. 否：No, you oughtn’t. /?:tnt/ 1. ought to????? ought to“应该”，后接动词原形，无人称和数的变化。ought to与should意义相近，通常可以互换，只是ought to的语气稍重。 e.g. You ought to / should be brave. I think they ought to / should protect the children. ought to的否定形式为ought not to，也可缩写成oughtn’t to。 含ought to的陈述句变为一般疑问句时，应将ought放在句首。在疑问句、否定句中以及作简略回答时，to可以省略。 e.g. Dad, you ought not (to) / oughtn’t (to) smoke so much. —Ought we (to) get there before six? —Yes, you ought (to). / No, you oughtn’t (to).? 【语境应用】用ought to将所给汉语句子 或对话翻译成英语。 1) 安(Ann)应该去看望她的老师。 Ann ought to visit her teacher.? 2) 你不应该在饭后做运动。 You oughtn’t (to) take exercise after