2015年卫生类职称英语考试语法独立主格结构：

此独立形式只是一个小短语，而不是主谓完整的简单句，又称之为独立分词构句。当分词意义上的主语不是主句的主语时，必须在分词前保留意义上的主语，否则语意不通。

独立主结构形式可用以表时间，理由，条件，伴随状态等。

He lay on the grass,the sun shining upon him.

= He lay on the grass,and the sun was shining upon him.

Weather permitting,I'll start tomorrow.

= If weather permits,I'll start tomorrow.

School being over,the boys went home.

= When school was over,the boys went home.

The sun having set,we arrived at the station.

= After the sun had set,we arrived at the station.

重点：当独立主格结构的主语表示“一般人”，如：we,one,you时，主语可省略，此用法常用于下列表达方式中：

generally speaking 一般来说

strictly speaking 严格地说

talking of …… 谈到

speaking of …… 说到

judging from …… 由……来判断

taking all things into consideration 把一切都考虑在内

considering …… 考虑到……

[示例]：

If we judge from his face,he must be ill.

= Judging from his face,he must be ill.

He has lots of books if we consider that he is young.

= He has lots of books,considering that he is young.