五、不定代词

     不是指明代替任何特定名词的代词叫做不定代词，在句中可作主语、表语、宾语和定语。现将几个常用的不定代词举例说明如下：

1. some 与 any 的区别
1）some 多用于肯定句，表示“一些，几个”作形容词时，后面可以接①不可数名词 + 单数动词；②可数名词 + 复数动词。
Look! Some of the students are cleaning the library.
Some rice in the bag has been sold out.
2）any 多用于疑问句、条件句和否定句中，表示“一些，任何”用作形容词时，后面可以接①不可数名词 + 单数动词；②可数名词 + 复数动词。
If you have any questions, please ask me.
There isn't any orange in the bottle.
Have you got any tea?
3）any 和 some 也可以作代词用，表示“一些”。 any 多用于疑问句或否定句中， some 多用于肯定句中。
How many people can you see in the picture?
I can't see any.
If you have no money, I'll lend you some.
注意：与 some, any 结合的词如 something, somebody, someone, anything, anyone, anybody 在肯定句、否定句、疑问句、条件句中的用法，大致和 some, any 的用法相同。
2. few, a few, little, a little 在用法上的区别
1）用作形容词：
I'm going to buy a few apples.
He can speak only a little Chinese.
There is only a little milk in the glass.
He has few friends.
They had little money with them.
2）a little 和 little 也可以用作副词， a little 表示“有点，稍微”， little 表示“很少”。
I'm a little hungry. ( 修饰形容词 hungry)
Let him sleep a little. ( 修饰动词 sleep)
Mary, go a little faster, please. ( 修饰副词比较级 )
She slept very little last night.