英语句子最常用的方法是通过使用一些关联词，如 and、or等，或标点符号如：分号，逗号，破折号等，若干个在语义上有联系或相互照应的单词、词组或子句连在一起组成一种并列或平行结构的长句，以表达一个复杂得多层次含义。这种句式虽然难度不一定很高，但在复杂长句中还是占了相当大的比例的.
从今天开始我们就由浅入深，来对这一类型的句子进行练习和攻克。希望大家通过练习能掌握分析这类句式的一般规律和方法。
Exercise
1.The intentional termination of life of one human being by another - mercy killing (安乐死) - is contrary to that for which the medical profession stands and is contrary to the policy of the American Medical Association.
2.Put them all together, exalt（提高）them above their present imperfections, add to them the vision of humankind redeemed, forever free of need and strife（争议）and you have a future lighted with the radiant colors of hope.
3.More than three million people live in inner London, and nearly five million people live in the surrounding suburban area, which is made up of formerly separate villages that have merged to form what is now called outer London
要点分析和参考译文
1.要点：句子主干有两个并列的谓语部分，即" is contrary to……and is contrary to……。" 词组mercy killing 是对前面内容的概括。for which the medical profession stands 是"that"的定语从句。
参考译文：有意识的结束一个人的生命--安乐死--既违反了医学界的职业立场，也违反了美国医学会协会的宗旨。
2.要点：此句的主干是一个由and 连接的并列结构。
第一部分有几个并列祈使句组成，第二部分是一个完整的主谓结构，全句主干即"Put…exalt…，forever free … strife and you have a future…colors of hope。
由于第一部分并列祈使句较长而第二部分较短，而且连接两部分的and前面有存在着另外一个and（need and strife）从而致使句子的结构较复杂，不易看出主干的并列结构。
3.要点：全句为并列复合句。 "and"连接并列句。第二个句子是主从复合句。"which"引出非限制性定语从句，修饰"area"。"that " 引出限制性定语从句，修饰 "villages"。"what" 引出名词从句作"form"的宾语