高中英语语法知识点很多，很多学生可能觉得学起来吃力，难以记牢。一般说来，学习语法知识的途径很多，但教学中常用的主要有如下二种：通过教师的讲解，对所学语法规则的概念、结构，用法有个确切的了解;当然还离不开大量的练习，在英语实践中正确、熟练地掌握语法规则的用法。以下是高考英语语法中-ed形式“独立主格结构”这一块知识点的整理。
-ed形式“独立主格结构”
与逻辑主语+动词的-ing形式一样，如果-ed形式的逻辑主语和句子的主语不一致的话，就需要用-ed形式的独立主格结构。
The book written in simple English, English beginners were able to read it.
该书是用简单英语写的，英语初学者也能看懂。
= As the book was written in simple English，English beginners were able to read it.
The workers worked still harder, their living conditions greatly improved.
由于工人们的生活条件大大加强，他们工作得更起劲了。
= As their living conditions were greatly improved, the workers worked still harder.
He was listening attentively in class, his eyes fixed on the blackboard.
他上课专心听讲，眼睛紧盯着黑板。
= He was listening attentively in class, and his eyes were fixed on the blackboard.
The task completed,he had two months' leave.
任务完成以后，他休了两个月的假。(=When the task had been completed,he had two months' leave.)
比较：
动词不定式表示动作没有发生或即将发生，动词-ed形式表示动作已经结束，动词-ing形式往往表示动作正在进行。
The manager looks worried，many things to settle.经理看上去很着急,有这么多的事情要处理。(事情还没有处理，而且是由经理本人来处理，用不定式to settle)
The manager looks relaxed, many things settled.许多事情已经处理好了，经理看上去很轻松。(事情已经处理好了，用动词-ed形式settled表示动作已经结束)
The food being cooked, the boy was watching TV.小孩一边做饭，一边看电视。(两个动作同时进行)
The food cooked, the boy went to bed. 饭做好了，小孩去睡了。(两个动作有先后，饭已做好，小孩才去睡觉的)
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