在雅思阅读文章中，状语修饰动词、形容词、副词或整个句子，通常由副词、介词短语、动词不定式、分词和从句等担当。现在我们主要学习其中的一种形式，即从句做状语成分，我们称之为状语从句。

　　状语从句主要用来修饰主句或主句的谓语。一般可分为九大类，分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。在今天的课堂中，我们先来学会识别时间，地点和原因状语从句。

　　雅思阅读常见状语从句一. 时间状语从句

　　1. 常用引导词：when, while, as, as soon as, since,before, after, till, until?

　　下面我们结合例句主要重点区分下when，while, as, since，till, until的区别

　　a )when引导的从句，强调的可以是时间点，也可以是时间段;

　　Marry was about to leave when the telephone rang. when you apply for a job,you must present your credentials.

　　a) while 一般强调的是一段时间，往往和进行时连用;

　　When the teacher paraphrased the text in English, the students listenedattentively and took notes.

　　c)as后面一般加一段时间，但时间状语从句用的较少;

　　We were having breakfast as she was combing her hair.

　　d)since 自从，主句常与完成时连用。

　　We’ve never met since we graduated from the college.

　　e) till /until till常用于肯定句，主句谓语为持续性动词时用;until一般用于否定句，多与瞬间动词连用;

　　Donald will remain in college till he finishes his Ph.D course.

　　I won’t go with you until I finished my homework.

　　2. 特殊引导词：

　　a) hardly …when,no sooner … than一…就…

　　Tom had hardly entered the room when the class began.

　　b) every time

　　I will be in trouble every time I see him.

　　c) the minute, the moment, the second, the day，the instant

　　I fall in love with him the moment I saw him.

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