初中英语练习题一道辨析：an　other,another,the　other　,other

another:几个同类当中的另一个.
eg.I want to buy a pen.I don't like the blue one,please
show me another.
other:表示没有范围的其他一个或一些 如：other people
the other：两者之中的另外一个：on one hand...on the other hand
the others:某个具体范围内除了一些之外的另外一些,注意下面两句句子的区别：
Some of my classmates are playing football,and the others are playing basketball.
Some of my classmates are playing football,and others are playing basketball.