1、不定代词other相当于名词或形容词,可以在句中作主语、宾语、定语等。相当于名词时,有复数形式others。
作主语：He has two toys. One is for me, the other is for himself.
作宾语：I have two pictures. You have seen one. Now I will show you the other.
作定语：There are other ways of helping him out of difficulty.
2、不定代词another是由an和other构成，由此可以判定它只能代替或修饰可数的单数名词，前面不再用冠词。可以在句中作主语、宾语、表语和定语。
作主语：One (girl) wanted to read, and another wanted to watch TV.
作宾语：Please give me another.
作表语：She is a fool, and her sister is another.
作定语：Would you like another cup of coffee?
3、对比other与another
（1）the other 用于两者中的另一个，another 指三者以上中的另一个：
He has two toys. One is for me, the other is for himself.
All these are not good. Show me another, please.
（2）another 还有 “再……” 的意思，other 有 “另外” 的含义：
Have another cup of coffee, please. 再喝一杯咖啡吧！
The girl is much cleverer than other three. 这女孩比另外三个都聪明。
（3）修饰数词的结构不同：数词+other+复数名词= another+数词+复数名词：
这周我多看了两本书。
I read two more books this week. =I read two more books this week.
（4）one another 与 each other：两者均表示“彼此”、“互相”。
一般认为，each other 用于两者间，one another 用于三者或以上，但在现代英语中，两者常可换用。
We should always help each other.
They don’t agree with one another.
