Quantifiers

Quantifiers are a type of determiner which denote imprecise quantity. They differ from numbers or numerals which indicate precise quantity.

The most common examples:
the most common quantifiers used in English are:

some / any ,  much, many, a lot, a few, several, enough.

There are three types of quantifier;

1. neutral quantifiers,
2. quantifiers of large quantity, and
3. quantifiers of small quantity

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1. Neutral quantifiers:

     Some and any: several, a number of,  etc.

Some and any are both quantifiers and articles. In many contexts, some is the plural indefinite article, the plural of "a" or "an"; but more often, some implies a limited quantity, and for this reason has the value of a quantifier.

Some is used in affirmative statements; it is replaced with any in negative and interrogative contexts. 

 Examples:

      I've got some apples in my basket and some water in my bottle.

     I haven't got any apples in my basket, nor any water in my bottle.

     Have you got any apples in your basket? Have you got any water in

     your   bottle?

     We had some visitors last weekend, but we didn't have any this

      Weekend

     Have you got any rooms free for the night of September 30th ?

     Several and a number of  imply "more than one, but less than a lot". They are not usually used in negative or interrogative structures, only in affirmative statements. For example

     There are several books / a number of books by J.Z.Plummerman in our library.
     Several people / A number of people said that they'd seen the missing child.

Enough 

Enough implies a sufficient quantity; it is used in affirmations, negations and questions.

We can get tickets for the concert, I've got enough money now.
Have you got enough money for the tickets?

NOTE:

 Do not confuse enough as a quantifier preceeding a noun, with enough as an intensifier following an adjective, as in:

    That's good enough for me.

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2. Large quantity quantifiers: 

     much, many, lots of, plenty of, numerous, a large number of, etc.

► Much and many: much is used with non count nouns (always in the singular); many is used with count nouns in the plural. (Click here for the difference between count nouns and non-count nouns).

     IMPORTANT NOTE: Much and many are not often used, in modern spoken English, in affirmative statements; but they are very commonly used in interrogative and negative contexts. 

 Examples:
I have many reasons for thinking that this man is innocent is acceptable, but rather formal; most English speakers would more naturally say:
   I have plenty of / a lot of / a large number of reasons for thinking .....
Much whisky is of very good quality. This sentence is technically acceptable, but not probable in modern English. Most people would say (and write):
   A lot of whisky / A good proportion of whisky / Plenty of whisky ......

Remember this principle: don't use much or many in affirmative statements. 

► Lots of, a lot of, plenty of, a large number of, numerous .
These expressions all mean  more or less exactly the same. In the list above, they are arranged in order of formality, going from the most informal (lots of) to the most formal (numerous). Informal language is more appropriate in dialogue, formal language in written documents.

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3. Small quantity quantifiers: 

 ►    few, a few, little, a little, not many, not much, a small number of, etc.

These quantifiers are normally only used in affirmative statements, to which they give a negative colouring.

► Little, a little, not much are used with non count nouns (always in the singular)
       Few, a few, not many are used with count nouns in the plural.

Examples:
Few people can speak more than three languages
A few (of the) paintings in this gallery are really good.
There's little point in trying to mend it. You'll never succeed!
I've got a little money left; let's go and have a drink.