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111B1m4Period III Grammar I & Grammar II一.确定目标 知识目标： 短语：so far，up to now，till now，pay back 语法：现在完成时 能力目标：掌握现在完成时和一般过去时的区别 情感目标：通过小组学习培养合作意识和对英语的兴趣。二基础自学用以下短语填空so far for a long time up to now in the past ten years since then1. Great! Ive been longing to visit the exhibition on the western artists .2. as I know, everybody wants to be a model student.3. Great changes have taken place in our hometown. 4. Ive never met him.5. Things have not change very much .三情景解疑现在完成时1. 构成：has / had + 动词的过去分词2. 基本用法： 表示过去发生或已经完成的动作对现在造成的影响和结果。可以表示最近完成的动作，也可以表示经历或经验。表示过去已经开始、持续到现在（可能还会继续进行下去）的动作或状态，常和表示一段时间的状语连用。3. 时间状语：just, recently, so far, up to now, till now, in the past, ever, never, for, since, these days, this year, now等。4. 短暂性动词和延续性动词： 短暂性动词用于完成时态时，不表示延续概念，不能跟表示一段时间的状语连用，需要时要用相应的延续性动词替换。常见的有：buy have, borrow keep, leave be away, die be dead, return be back, put on wear, catch a cold have a cold, fall asleep be asleep【例】 Since two years ago.A. How long have you joined Greener China?B. How long did you join Greener China?C. When did you join Greener China?D. How long have you been with Greener China? 解析：Since two years ago.表示的是时间段，因此问话问的应该是多长时间，答案在A，B和D之间选。由于动词join是短暂性动词，无延续性，不能与表示一段时间的状语连用，故选D。四合作探究【思考】读下列例句，说说一般过去时和现在完成时的区别是什么？ The light has gone out. The light went out. 五巩固检测1. Im sorry to keep you waiting. Oh, not at all, I here for only a few minutes. A. have been B. had been C. was D. will be2. Do you know our town at all? No, this is the first time I here. A. was B. have been C. came D. am going3. I wonder why Jenny us recently. We should have heard from her by now. A. hasnt written B. doesnt write C. wont write D. hadnt written4. The weather makes so much trouble. It every day so far this week. A. will rain B. rains C. has rained D. rained5. Ann me her address but Im afraid I it. A. gave; have lost B. has given; have lost C. gives; lost D. had given; lost六学习总结 B1m4Period III Grammar I & Grammar II二基础自学1. for a long time 2. So far 3. in the past ten years 4. Science then 5. up to now四合作探究 The light has gone out. 灯已经灭了。（现在还没亮。） The light went out. 灯灭了。（灯以前灭过，现在可能是亮的。）现在完成时强调过去发生的动作对现在造成的影响或结果；一般过去时则表示单纯的过去的事实，与现在没有联系。五巩固检测 ABACA111
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