2015年卫生类职称英语语法：主动句转换为被动句

主动句变为被动句是通过这样转换而实现的：

1.把主动句的宾语转换为被动句的主语；

2.把主动句的谓语换成被动语态；

3.把主动句的主语前加by构成短语，放在被动语态的谓语之后。此by…短语根据需要而定，有时可以省略。

注：

①带有介词或副词的短语动词，如call on， carry out， look after， take care of等用被动语态时，应视为不可分割的一部分，后面的介饲或副词不能丢掉，如：

主动句：Grandma looks after my younger brother well.

被动句：My younger brother is well looked after （by my grandma）

接下来我们一块来分析几个选自《职称英语等级考试用书》上的句子：

1.Cement was seldom used in building during the Middle Ages.

2.Dyslexia first was recognized in Europe and the United States more than 80 years ago.

3.However,research has shown that dyslexia is more common in males than in females,and it is found more often in persons who are left-handed.