Unit 3《The world online》Welcome to the unit Reading 课件（牛津版选修7）.ppt

①表示与现在或将来事实相反，主句谓语动词用would/could /should/might+动词原形。 ②表示与过去事实相反，主句谓语动词用would/could/should/ might+ have done。 【名师点津】类似without这样能够表示含蓄条件的词语还有：but for(要不是)，otherwise(否则)，or(否则)等。 【真题在线】(2011·陕西高考)I_____ through that bitter period without your generous help. A. couldn’t have gone B. didn’t go C. wouldn’t go D. hadn’t gone 【解析】选A。考查虚拟语气。句意：要是没有你慷慨的帮助，我不可能度过那段痛苦的时光。without含蓄条件结构表示与过去事实相反，主句谓语动词用would/could/should/might+ have done。 7. The main drawbacks of the Internet I will address today are that it has too much information that has not been evaluated for accuracy, and that it is transforming the way people spend their time. 【分析】 【想一想】定语从句的引导词在什么情况下可以省略呢？ 【拓展延伸】1. 当关系代词who, whom, which和that在定语从句中用作动词宾语或用作位于句末的介词的宾语时，可以省略。 Is there anything (that) you want? 想要什么东西吗? Who is the man (that) you were talking to? 刚才和你讲话的人是谁? 2. 当way(方式)在后面所接的定语从句中作状语时常省略that, in which。 I don’t like the way you treat your classmates. 我不喜欢你对待你同学的方式。 【即学即练】将上面句子翻译成汉语 _______________________________________________________________________________________________ 我今天所要谈及的因特网的主要缺点是网上有太多未经核准的信息，以及它正改变人们使用时间的方式。 1. evaluate vt. 评估，评价 Learn to evaluate all the situations you find. 学着去评估你发现的所有情况。 【辨析】 assess value estimate evaluate 指依据某个标准来评定人或物的价值 根据人的经验和知识对事物作出推断 指对人的能力、成就作出评估，或对事物的效用、价值评估 指对某一形势作出判断、评价，也可指对事物的价值作出准确估计 【即学即练】用evaluate、estimate、 value和 assess的适当形式填空 ①Scientists _________ that smoking reduces life expectancy by around 12 years on average. ②It can be difficult to ________ the effectiveness of different treatments. ③We decided to get the house paintings ______. ④The value of the business was _______ at 1. 25 million dollars. estimate evaluate valued assessed 2. drop out退学，辍学; 退出，脱离 ①One university did a study about the students who had dropped out, and found that 43 per cent of them were heavy Internet users. 有所大学对辍学学生做过一次调查，发现他们中43%属于网络迷恋者。 ②We should help those who drop out of university because of economic reasons. 我们应该帮助那些由于经济原因从大学退学的学生。 ③He had to drop out of th