11.(定语从句，非谓语动词(过去分词))Another simple form of poem that students can easily write is the cinquain, a poem made up of five lines.(另外一种学生容易写的简体诗是由五行组成的,叫做五行诗。)

　　12.(with的复合结构作状语)With so many different forms of poetry to choose from，students may eventually want to write poems of their own.(有了这么多可供选择的诗歌类型,学生们最终也许想自己作诗了。)

　　13.(宾语从句)I think my long and active life must be due to the healthy life I live.(我想我之所以长寿而且精力充沛,要归功于我的健康生活。)

　　14.(非限制性定语从句，非谓语动词(过去分词))First, you can become physically addicted to nicotine, which is one of the hundreds of chemicals in cigarettes.(首先,你会在身体上对尼古丁有瘾，它是香烟里几百种化学物质之一。)

　　15.(宾语从句，插入语，it作形式主语)I didn't know, for example, that it could do terrible damage to your heart and lungs or that it was more difficult for smoking couples to become pregnant.(例如，我不知道抽烟能严重侵害人的心脏和肺部，也不知道吸烟的夫妇生育能力会下降。)

　　16.( It is(not) +adj.(+for sb./sth.) + to do sth.)It isn't easy to stop smoking, but millions have managed to quit and so can you.(戒烟不容易，但许许多多的人都成功地戒掉了烟，所以你也能戒烟。)

　　17.(宾语从句)Every time you feel like smoking a cigarette, remind yourself that you are a non-smoker.(每当你想要吸烟的时候,你就提醒你自己,你(已经)是不吸烟的人了。)

　　18.(强调句型)It is only when the disease has progressed to AIDS that a person beginsto look sick.(只有当这种病毒发展成艾滋病时,人才会显出病态。)

　　19.(同位语从句)All scientists subscribe to the view that the increase in the earth's temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy.(所有的科学家赞同这种观点：人们为了生产能量而燃烧化石燃料如煤、天然气和石油，从而引起了地球温度的升高。)

　　20.(主语从句 (it做形式主语))It means that more heat energy tends to be trapped in the atmosphere causing the global temperature to go up.(这意味着更多的热量被困在大气层中，从而引起全球温度上升。)