听、说、读、写是学习英语必须掌握的四项基本技能。对于理工科院校的学生来说,提高阅读能力尤为重要。在训练阅读能力的初级阶段,掌握英语的结构信号,对于提高阅读能力是十分重要的,因为迅速准确地阅读理解句子是基本功之一。我们都知道,表达一个完整思想的基本语言单位是句子。句子是由词组成的。每个词都具有一定的词汇意义。然而,仅仅认识单个的词,并不能准确地理解句子的意思。要准确地理解句子所表达的意思,必须判断词在句子中所起的作用。英语是怎样表示词在句子中的作用呢?一般来说,有四种方法, Listening, speaking, reading and writing are four basic skills that must be mastered in learning English. For science and engineering students, to improve reading ability is particularly important. In the initial stage of training reading ability, grasping the structural signals of English is very important for improving reading ability, because reading and understanding sentences quickly and accurately is one of the basic skills. We all know that the basic language unit for expressing a complete idea is the sentence. Sentences are composed of words. Each word has a certain vocabulary meaning. However, understanding only a single word does not accurately understand the meaning of the sentence. To understand exactly what the sentence means, one must judge the role that the word plays in the sentence. How does English represent the role of words in sentences? In general, there are four ways,