下学期 Unit 20 Mainly revision－教学教案

下学期 Unit 20 Mainly revision－教学教案,标签：高一下册英语教案,高中英语教案,http://www.67xuexi.com
　　It is believed that there is plenty of oil off our coast. 据信我国沿海有大量的石油。
　　2）介词by在这儿和-ing形式连用，表示“用……方式”，“靠……手段”的意思。例如：
　　It is thought that he (has) made much money by selling cigarettes. 人们认为他靠卖香烟赚了很多钱。
　　At the same time another kind of paper was developed, made form silk. 在这一时期，研制了另一种纸，它是用丝帛制成的。
　　1）at the same time 作“同时”解。如：
　　They went their different ways, but arrived at the same time. 他们走的是不同的路线，但却同时到了。
　　2）made from silk过去分词短语作定语，相当于一个非限制性定语从句，which was made from silk修饰主语another kind of paper.
　　The problem was that it was too valuable for everyday use. 问题是这些丝织品太贵重，用作日常的书写太昂贵。
　　（1）句中的“The problem is that…”是个常用句型，在英语语法中，它被称作“主系表” （主语+连系动词+表语）结构。而其中的表语用了一个从句形式（that-clause）。这类句型的主语往往用下列名词question, reason, result, fact, suggestion等。例如：
　　The question is whether we can finish our work by tomorrow evening. 问题在于我们能否在明晚以前完成我们的工作。
　　The fact is that he never told me the truth. 事实是，他从未对我讲真话。
　　2）句中的“too…for”表示“太……以致不好/不能……”。这里的介词for所接宾语（内容）有否定的含意。例如：
　　The room is too small for us three. 这房间太小，我们三人住不下。
　　说明：“too…to”也表达同一含意。区别是：for +n/ pron.; to+in f.。
　　By the first century the making of paper in some parts of China had been well developed and had become common. 到了公元一世纪，中国有些地区造纸业已十分发达并且变得普遍了。
　　本句有两个并列谓语，都用了过去完成时态（had been well developed和had become common），表示在过去某一时间之前已经发生的动作。这一过去时间是通过介词by的短语(By the first century)来表示的。又如：
　　She had not finished her report by yesterday afternoon. 到昨天下午为止，她还没有写完报告。
　　By the end of last week all the plans had been made. 到上周末为止，所有的计划都订出来了。
　　They carved a whole page of characters back to front in the wood
　　“back to front” 是一个合成词，作“反面地”解，在句中作状语，修饰动词carved。
　　这种合成词是“名词+介词+名词”构成。词与词之间应有连字符连接，如：
　　如face-to-face（面对面）、back-to-back（背面背）
　　　side-by-side（肩并肩）、hand-in-hand (手牵手)等
　　这种合成词在句中多作定语；词与词之间无连字符连接、多作状语。例如：
　　The boy has his sweater on back to front.
　　He came face to face with death.
　　Although these were much more useful than the metal pots, they were still difficult to read and were very heavy to carry. 和

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