1. Quantifiers - Few / Little / A Few / A Little
THese quantifiers are used to show a small quantity of something, for example "I have a few books" means I have a small quantity of books.

A Few
A few is used with countable nouns to show a small quantity. It is used in affirmative statements, but not negatives. We generally use any or questions. For example:
- I have a few books.
- I don't have a few books
This is incorrect.
- I don't have any books
This is correct.
- Do you have a few books?
Sometimes this is possibe, but generally speaking we use any for questions, for example "Do you have any books?"

Few
There is an important difference between a few and few. Few without a is used to mean we don't have enough of something. For example:
- She has few apples in the refrigerator. (She doesn't have enough apples).
- She has a few apples in the refrigerator. (She has a small quantity of apples)

A Little
A little is used with uncountable nouns to show a small quantity. Again, it is generally used in affirmative statements, not negatives or questions. For example:
- I have a little orange juice.
Negatives and Questions use "any" as usual.
- I don't have a little orange juice.
This is incorrect.
- I don't have any orange juice.
This is correct
- Do you have a little orange juice?
Again, we generally use any for questions, for example "Do you have any orange juice?"

Little
As with few, there is also the same difference between a little and little. Little without a is used to mean we don't have enough of something. For example:
- She has little for breakfast. (She doesn't eat enough for breakfast).
- She has a little for breakfast. (She has a small quantity of food for breakfast).