1、1. 【课文原句】 The garbage is then taken away and, if possible, recycled. 【句型解读】 这里if possible为状语从句的省略，其完整形式为if it is possible。状语从句省略主语时，连词后若是系表结构，主语和系动词均可省去；若没有系动词，则将连词后的实义动词变成分词即可。各种状语从句均可用“连词+形容词 / 现在分词 / 过去分词”的省略结构。如：Look out when crossing the street. 过马路时要当心。Though refusing to come, he still arrived
2、. 他虽然拒绝来，但还是来了。She hurried away as if angry. 她急匆匆地离去好像生气了。【知识复习】 if引导的其他常见省略情况：if yes“如果这样的话”；if not“不这样的话”；if any“如果有的话”；if necessary“需要的话”；if so“如果是这样的话”；if ever“如果曾经有的话”。2. 【课文原句】 The “Green” movement tries to get governments to think seriously about the environment and how to look after it. 【句型解
3、读】 句中的how to look after it为“疑问词 + 不定式”结构，作用相当于名词性从句，可在句中作宾语、主语、表语等。常用疑问词有：what, which, when, where, how, whether,if等。如：How to do it is not decided. 怎么做还没有定下来。We haven?蒺t decided when to start. 我们还没决定何时出发。Have you been told what to do if there was an earthquake? 有没有人告诉你地震了该怎么办？3. 【课文原句】 A temple is a
4、 place of great importance to Buddhists.【句型解读】句中的of great importance为介词短语作定语，修饰place，相当于that / which is of great importance。be of + 抽象名词 = be + 名词相应的形容词形式：be of great / much + value / importance / use / help = be very + valuable / important / useful / helpful。如：This dictionary is a great help to my
5、translation, but that one is of no use. 这本词典对我的翻译很有帮助，但那一本一点用也没有。【知识复习】 be of + a / an或the same + n.（表“属于、归于”的这类抽象名词没有相应的形容词形式）。如：The two are of an age, but are of different heights. 这两人年龄相同，但身高不同。be of the same size / weight / height / age / colour / kind / type4. 【课文原句】 Is it possible to see the r
6、elics now that they have been submerged? 【句型解读】 句中now that也可为in that，常译为“既然”，表示原因，引导原因状语从句。如：Now that you can?蒺t answer the question, I?蒺ll ask someone else. 既然你回答不出这个问题，我就问问别人。Now that you are busy, let me do it for you. 既然你忙，就让我给你做吧。5.【课文原句】 The village is near the lake. My grandparents used to li
7、ve in it. 【句型解读】 句中的used to do sth. 为固定搭配，意思为“过去常常做”。如：I used to go to the office on foot but I don?蒺t do that now. 我过去常常步行上班，但现在不这样了。【知识复习】（1）be used to do的意思是“用来做”，是实义动词的被动语态的基本用法。如：Wood can be used to make the couch. 木头能用来做沙发。（2）be used to sth. / doing sth.固定短语，意思为“习惯于（做）”，其中to是介词。如：I am used to driving in all kinds of weather. 我习惯了在各种天气条件下开车。