学会分析英语长难句，高考，四六级，考研，雅思，托福通通不是问题。句子公式：句子=主干+修饰主干：主系表，主谓，主谓宾，主谓宾宾，主谓宾补一个句子的主干一般比较简单，造成句子复杂的是修饰成份和并列结构。英语中主要的修饰成分有五种，称为"三长两短"。
For Example :The individual traveling merchant who alone handled virtually all aspects of exchange evolved into an operation involving three separate types of merchants: the sedentary merchant who ran the “home office，” financing and organizing the firm’s entire export-import trade;
