英语选择性必修 第一册Unit 6 Nurturing nature公开课ppt课件

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Unit 6　Nurturing nature
内容索引
INDEX
语法导学 感悟规律 重点难点剖析
达标检测 当堂检测 基础达标演练
Period Four　Grammar—Present perfect continuous
语 法 导 学
PART 1
感悟规律 重点难点剖析
感知以下课文原句，补全方框下的小题
1.All this time，the song “Sky Railway” has been playing inside my head.2.The journey has been flying by，and before I know it...3.The Qinghai-Tibet Plateau has been attracting people’s admiration for centuries.4.Now，thanks to our efforts，passengers from all over the country have been enjoying these magical landscapes.
语法导学
现在完成进行时表示动作开始于 ，并一直持续到现在，动作可能仍在进行，也可能刚刚结束。现在完成进行时的构成：____________________ ，如句1、句2、句3和句4。
have/has been＋现在
分词
过去
一、现在完成进行时现在完成进行时由“have/has been＋现在分词”构成。1.现在完成进行时的用法(1)现在完成进行时表示动作从过去某一时刻开始一直延续到现在或离现在不远的时间，其动作是否继续下去，则由上下文语境而定。该时态多用于延续性动词，如live，learn，lie，stay，sit，wait，stand，rest，study等，并常和all this week，this month，all night，all the morning，recently等时间状语以及since和for引导的时间状语连用(与since和for连用时，动作常会继续下去)。
语法精析
I have been waiting for an hour and he still hasn’t turned up.我已经等了一个小时了，可他还没出现。I’ve been writing letters all this morning.今天上午我一直在写信。How long have you been living here?你在这里住了多久了？(2)有时现在完成进行时所表示的动作并不是一直在不停地进行，而是在断断续续地重复。这时现在完成进行时可用于瞬间动词。He’s been shaving since last year.他从去年开始就一直刮脸。You have been saying for a year that you will study abroad.整整一年你都在说要出国学习。
2.现在完成进行时中时间状语的省略现在完成进行时在上下文清楚时亦可不用时间状语。这种现在完成进行时多指“刚才”或“近来”发生的动作，一般不再继续，并往往含有一种直接的结果。You’ve been working too hard.你工作太辛苦了。(直接结果可能是你一定很累了)You’ve been smoking again.你又抽烟了。(暗含结果是你身上有烟味)Who’s been insulting you?谁欺负你了？(对方可能在哭)
3.现在完成进行时的感情色彩现在完成进行时和其他进行时态一样，也可以带有感情色彩。I have been wanting to meet you for a long time.和你见面是我盼望已久的事。Too much has been happening today.今天发生太多事了。
二、现在完成进行时与现在完成时现在完成进行时是兼有现在完成时和现在进行时二者基本特点的时态。由于它有现在完成时的特点，所以它可以表示某一动作对现在产生的结果或影响；由于它有现在进行时的特点，所以它也可以表示某一动作的延续性、临时性、重复性、生动性乃至感情色彩。现在完成时和现在完成进行时的比较：1.现在完成进行时可以表示动作的重复，而现在完成时一般不表示重复性。Have you been meeting him recently?你最近常和他见面吗？Have you met him recently?你最近见过他吗？
2.现在完成进行时有时含有感情色彩，而现在完成时一般是平铺直叙。I have been waiting for you for two hours.我一直等了你两个小时。(可能表示不满)I have waited for you for two hours.我等了你两个小时。(说明一个事实)3.现在完成进行时强调动作，而现在完成时强调结果。Who has been eating the oranges?谁一直在吃橘子呀？(还剩余一些)Who has eaten the oranges?谁把橘子吃了？(强调吃得一个不剩)
4.有些动词不能用于现在完成进行时，但可用于现在完成时。如：表示状态的动词：be，have，exist等；表示感情的动词：like，love等；表示感觉的动词：see，hear，know等。He has had a cold for a week.他已经感冒一周了。I have liked jazz since I was a teenager.从青少年起我就喜欢爵士乐了。I have known her for a long time.我已经认识她很长时间了。
5.与一段时间连用时可以用现在完成时也可以用现在完成进行时；但与“次数”连用时只能用现在完成时，不能用现在完成进行时。
6.这两种时态都可以表示动作的延续，区别在于：现在完成进行时更强调动作的延续性，可以说是现在完成时的强调形式。We have been living here for ten years.We have lived here for ten years.我们在这里住了十年了。7.在没有时间状语的情况下，现在完成进行时表示动作仍在进行，而现在完成时则表示动作到现在已经结束。The students have been preparing for the exam.学生们一直在为考试做准备。(还在进行)The students have prepared for the exam.学生们已经为考试做了准备。(已经结束)
返 回
达 标 检 测
PART 2
当堂检测 基础达标演练
1.It is the most instructive lecture that I (attend) since I came to this school.2.Years ago we didn’t know this，but recent science (show) that people who don’t sleep well get ill easily.3.The two friends (chat) on the Internet for three hours，and they will go on till next morning.4.—How long you (work) in the factory?—Since 1990.5.The first use of atomic weapons was in 1945，and their power ___________ (increase) enormously ever since.
have attended
has shown
have been chatting
have
been working
Ⅰ.用所给词的适当形式填空
has been
increasing
6.—Do you regret not having gone abroad?—Not at all.I (not，earn) as much，but I’m glad to contribute to our motherland.7.—Oh，no! We’re too late.The train (leave).—That’s OK.We’ll catch the next train to London.8.In order to find the missing child，villagers (do) all they can over the past five hours.9.The manager (tell) the workers how to improve the program since 9 am.10.—Look! Somebody (clean) the sofa.—Well，it wasn’t me.I didn’t do it.
haven’t earned
has left
have been doing
has been telling
has cleaned
1.Your clothes are covered with dust.You the classroom，I think.你的衣服满是灰尘，我想你刚才一直在打扫教室吧。2.You look thin and tired.You too hard.你看起来又瘦又累，你近来工作一定很辛苦。3. you can succeed for five years.五年来你一直在说你能成功。4.I some cities of China this month.这个月我一直在访问中国的几个城市。
have been cleaning
have been working
You’ve been saying
have been visiting
Ⅱ.完成句子
5.I this book for two hours，but I haven’t finished it.这本书我已读了两小时了，但我还没读完。
have been reading
返 回
Unit 6　Nurturing nature