自己造了几个句子，帮忙看下.如有错请帮忙改正

I have two books. One is yellow and the other is blue.
I have five biscuits. I ate three and two are left over.
I don't like this banana. Could you get me another one? (enjoy 很错。还有，英语是很礼貌的...)
Some fruit are sour, some sweet. 不用复数。fruit 统称水果。

第三句bring的后面应该加个me好点吧
第四句应该用others ，还有水果好像是可数名词哦，要把is改成are吧
others用在复数代词

Some fruit is sour,other is sweet应该用复数
others表示 其余的；别的；其他的，是一个整体除掉一部分后剩下的

other是代词，代替前面的名词的，它也就有名词的性质即当名词用，others是other的复数形式。 它俩前面加the就是用定冠词修饰表特指。another就是an+other的组合，不知写这些能否对你理解这几个词有所帮助。
others可以这么用
Some pencils are long,others are short.
others指代其它的短铅笔

you'd better bring another one.
-----------------bring me another

Some fruit is sour,other is sweet.
------Some fruits are sour,others are sweet.

这儿不是复数，因为fruit不是可数名词。Some对other，在可数名词后，Some对others，要加S！例如：
Some boys are reading；others are listening to the radio.
希望您能认可我的答案！！！