lesson 3 Clean Machines 学案1. 区别现在完成进行时和现在完成时I have been reading the book. 我一直在读这本书。I have read the book. 我已经读了这本书。牢记：现在完成进行时（have been doing）表示“一直” 现在完成时（have done）表示“已经”可见：现在完成进行时表示某一个动作从过去开始发生，一直延续到现在，并有可能继续下去。 翻译：我已经完成作业了。 我一直等了你三个小时。 他已经死了。 他们一直在修那条马路。 We have cleaned the classroom. We have been cleaning the classroom.2. interest vt. 使……发生兴趣。 n. （不可数）兴趣（和 in 连用） The story interests me very much. The story is interesting. 令人感兴趣的 I am interested in the story. 对……感兴趣 I have / show / take an interest in stamp collecting. 对……有兴趣/对……表现出兴趣/对……产生兴趣 翻译：我对你说的不感兴趣。 男孩对这部有趣的电影感兴趣。 他对看电视表现了极大的兴趣。3. so far 到目前为止（常和现在完成时连用） We haven’t heard from him so far. 翻译：到目前为止，他只完成了一半作业。 到日前为止，这道数学題还没算出来。4. persuade vt. 说服; 使相信 I persuaded him to go with us. 说服某人做某事 He persuaded me of his sincerity(诚意). 使某人相信 翻译：我将劝他加入我们的俱乐部。 她说服我买下这本书。5. average n. 平均 adj. 平均的 v.平均达到 The average age of the boys in this class is fifteen. He averaged nine hours' work a day. The rainfall there averages 300 mm a year. 翻译：将 7, 14, 6 之和均分得 9。Key1. I have finished my homework.I have been waiting for you for 3 hours.He has died.They have been building / repairing the road.我们已经清洁了教室。1我们一直在清洁教室。2. I’m not interested in what you said. The boy was interested in the interesting film. He shows a great interest in TV.3. He has only finished half of his homework so far. The maths problem has not been worked out yet. 4. I will persuade him to join our club. He persuaded me to buy the book. 5. If you average 7, 14 and 6, you get 9.2
