①other可以作形容词用，后面可以跟单数或复数名词，意思是“其他的、别的”。
Where are his other books？
I haven't any other books except this one.
②other 也可以用作代词，与冠词the连用构成“the other”，表示两个人或物中的“另一个”。常与one 搭配构成“one…，the other.”句型。
He has two brothers.One is 10 years old，the other is 5 years old.
She held a ruler in one hand and an exercise-book in the other.
③other作代词用时，可以有复数“others”，泛指“另外的人或物”。常与some 搭配构成“some..，others.”句型。
Some went to the cinema，others went swimming.
This coat is too large.Show me some others，please.
④“the others”表示特指某范围内的“其他的人或物”。
We got home by 4 o'clock，but the others didn't get back until8
o'clock.
In our class only Ton is English，the others are Chinese.
⑤another 可以作形容词用，修饰后面的名词，意为“另一个”，还可以跟代词one.
You can see another ship in the sea，can't you？
Mary doesn't want to buy this skirt.Woul d you please show her another one？
@another也可以作代词用，表示“另一个”。
I'm still hungry after I've had this cake.Please give me another.