高中英语外研版 (2019)选择性必修 第一册Unit 5 Revealing nature公开课课件ppt

这是一份高中英语外研版 (2019)选择性必修 第一册Unit 5 Revealing nature公开课课件ppt，共22页。PPT课件主要包含了had got，had worked，had known，had been，arrived，Practice，for，to blame等内容，欢迎下载使用。

Part 1 Studying the rulesPart 2 PracticePart 3 Language pints
Read and pay attentin t the wrds in red. What d they functin?
1．The American sldiers fund that the Chinese sldiers had lst their lives in the freezing muntains.
2．My grandma said that she had bught enugh vegetables.
过去完成时：过去的过去
过去完成时的动作需在过去某一时间之前发生，即发生在“过去的过去”。1．过去完成时的构成过去完成时是由“had＋过去分词”构成的。I realized I had made a serius mistake.我意识到我犯了一个严重的错误。The by sitting beside me n the plane was very nervus. He had nt flwn befre.飞机上坐在我旁边的男孩很紧张。他以前从没乘过飞机。
2．过去完成时的用法①“已完成”的用法：表示某一动作或状态在过去某一时间之前或过去某一动作之前已经完成。句中常用by引导的时间状语或以befre，until，when，than等词引导的内含一般过去时的时间状语从句。By 7:00 yesterday mrning we had dne that wrk.到昨天早上7点钟时，我们已经做完了那件工作。He had just finished sweeping the classrm when the teacher returned frm the ffice.老师从办公室回来时，他刚把教室打扫完。
在包含befre和after的复合句中，因为从句动作和主句动作发生的先后顺序已经非常明确，可以用一般过去时代替过去完成时。The train (had) started befre I reached the statin.在我到达车站之前，列车已经开了。After he (had) arrived in England，Marx wrked hard t imprve his English.马克思到达英格兰之后，努力提高他的英语水平。
②“未完成”的用法：表示一个动作或状态在过去某一时刻之前就已开始，一直持续到这一过去的时间，还可能再持续下去。Up t that time all had gne well.直到那时一切都很顺利。Jhn and Jane had knwn each ther fr a lng time befre their marriage.约翰和简在结婚前就认识很长时间了。
③“想象性”的用法过去完成时有时表示一种未实现的愿望或想法，主要用在if引导的和过去事实相反的条件句以及wish，as if引导的从句中。If she had wrked hard，she wuld have succeeded.要是她努力的话，她就会成功了。(事实上她没努力，也没成功。)I wish I had gne with yu t the cncert.我要是和你一起去音乐会就好了。
④表示“刚刚……就……”过去完成时常用在，n 等结构中，表示“刚刚……就……”。Hardly had he begun t speak when the audience interrupted him.他刚开始演讲，听众就打断了他。N sner had he arrived than he went away again.他刚到就又走了。intend，mean，hpe，want，plan，suppse，expect，think等动词的过去完成时可以用来表示一个本来打算做而未做的事。I had meant t cme，but smething happened.我原本打算来的，但有事发生了。
3．过去完成时与一般过去时的比较一般过去时表示过去某个时间的动作或状态。过去完成时表示的动作或状态发生在一般过去时表示的动作或状态之前，因此它在时间上表示的是“过去的过去”。Yesterday I returned the bk that I had brrwed.昨天我归还了借的书。He didn't knw a thing abut the verb，fr he had nt studied his lessns.他对动词一无所知，因为他没有好好学习功课。I had been at the bus stp fr 20 minutes when a bus finally came.我在车站等了20分钟后车才来。
Talk abut yur experience abut nature using had dne.
It was the first time that I had visited the Wetland Park.
I had expected t g hiking with yu, but I was stuck in my prject.
1　characteristic n．特征，特性(教材P53)　Gregr Mendel chse t study pea plants because their characteristics were easy t cntrl.格里哥·孟德尔之所以选择豌豆作为研究对象，是因为豌豆的特性易于控制。[例]　The need t cmmunicate is a key characteristic f human sciety.需要交流是人类社会最重要的一个特征。[造句]　这两组儿童具有截然不同的特点。The tw grups f children have quite different characteristics.[知识拓展](1)characteristic adj.　典型的；独特的；特有的be characteristic f＝be typical f 是……的典型特征(2)character n. 性格，特征；人物，角色；字体
Language pints
characteristics
2　blame v．责怪，指责；把……归咎于(教材P53)　The extinctin f the Pinta Island trtise is blamed n humans.平塔岛龟的灭绝要归咎于人类。[例1]　She desn't blame anyne fr her father's death.她没把她父亲的死归罪于任何人。[例2]　Hw can I blame him? It wasn't intentinal.我怎么能怪他呢？那又不是有意的。
3　decline vi.下降；减少；衰退；拒绝；谢绝　n．下降；衰退；衰退期(教材P53)　After gats in particular had been brught t the island，the Pinta Island trtise ppulatin declined.特别是山羊被带到岛上后，平塔岛龟的数量下降了。[例1]　The number f staff has declined frm 7,000 t 4,000.员工人数已从7 000人减少到4 000人。[例2]　The cmpany reprted a small decline in its prfits.公司报告其利润略有减少。
(1)decline(frm...)t...　 (从……)下降/减少到……decline by 下降/减少了……decline ding/t d sth. 婉言拒绝做某事(2)fall int (a) decline 开始衰落，衰弱下去；走下坡路a decline in ……的下降in decline 在下降，在衰退