1、lesson3 Clean Machines学案要点一览：主要词汇petrol, gas, solar, racer, sunlight, kindergarten, chapter, impression, reliable, golf, appreciate, essay, shopping主要短语so far, take place, all the time, find out主要语法现在完成时和现在完成进行时要点详解：1. so far 到目前为止，迄今为止What do you think of the show so far?到目前为止你觉得这场演出怎么样？Detective a
2、re so far at a loss to explain the reason for his death.至今侦探对他的死因仍茫然不解。2. take place 发生，举行A concert will soon take place.即将举行一场音乐会。Great changes have taken place since 1976.1976以来发生了巨大的变化。拓展：take down 写下，拿下来take up 占，占地方take turns 轮流take to 喜欢，染上take on 接受，雇佣take off 起飞，脱掉take for 错当作take after 模仿，长
3、得像3. all the time 一直，始终Air pollution is getting worse all the time.空气污染越来越严重。拓展：ahead of time 提前at the time 在那时，在那段时间at one time 从前，一度at a time 一次，逐一at times 间或，有时in time 迟早，及时from time to time 不时in no time 立刻，很快on time 准时练习：翻译句子：1. 科学家们正在做一项迄今为止没人做过的实验。2会议即将举行3他已经习惯一直在外面吃饭了4我们迟早会查明事情的真相5他跟他的新同学相处得很好Keys:1. The scientists are doing experiments no one has so far attempted.2. The meeting will take place soon.3. He is used to eating out all the time.4. We shall find out the truth early or late.5. He gets on well with his new classmates.
