Теория:

Study the information about quantifiers and countable/uncountable nouns.
  
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Quantifiers are words like little, few, plenty of.

They can combine with countable nouns, some with uncountable and some with both types.
 
1. Quantifiers + plural countable

Both
A few, few
Fewer
The fewest
a/the majority of
many
a minority of
a number of
 
2. Quantifiers + uncountable

An amount of
A bit of
A great deal of
A good deal of
(a) Little
Less
The least
Not much
 
3. Quantifiers + plural countable, uncountable
  
Some
Any
Enough
No, none of the
A lot of
Lots of
Hardly any
More/most
Plenty of
 
4. Quantifiers + singular countable

All of the
Any/some
Each
Either
Every
Most of the
Neither
No, none of the
 
Examples:

I bought some books to read.

I bought a few apples to eat.

She had little time to do this project.
Источники:
blog.harmonhall.com
L.G Alexander. Longman English Grammar practice for intermediate students- Harlow: Longman, 296p.