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.