第一，当比较的对象属于同一类人或物时用of。
例如:
①She is the youngest girl of the three.
②He runs fastest of the three.
第二，若将比较的对象放在某一范围内时则用in。
例如:
①She is the youngest girl in our class.
②He runs fastest in our class.
另外，如果比较的对象与人称代词宾格形式搭配时就用介词among。
例如:
①She is the youngest girl among us.
②He runs fastest among us.
根据上述规则试译下列句子。
1.李明是他们当中最高的。
2.我们三人中，我弟弟干这工作最细心。
3.工人阶级是人类历史上最伟大的阶级。
Key:
1.Li Ming is the tallest among them.
2.My younger brother did the work most carefully of us three.
3.The working class is the greatest class in the history of mankind.
