MUCH, MANY and A LOT OF

Quantifiers are words that show how much there is of something - they show quantity. Much, many, and a lot of indicate a large quantity of something, for example "I have a lot of milk" means I have a large quantity of milk.

Much

Much is used with uncountable nouns, and is generally used in negative statements and questions. It's uncommon to use much in positive statements. For example:
- I don't have much money (NOT VERY COMMON)
- Do you have much time?
- "I have much time." This sounds unusual.



Many

Many is used with plural countable nouns, and is often used in negative statements and questions. It is also used in positive statements however. For example:
- I don't have many apples.
- Do you have many friends?
- Many people come here in summer.

Much and many can be used in positive statements, but give a more formal meaning. For example:
- He has many good friends from Harvard University.

A lot of

A lot of is used with uncountable and countable nouns, and is generally used for positive statements. For example:
- I have a lot of friends (countable)
- I have a lot of time (uncountable)

A lot of is also used in questions, especially when you expect a positive response. Although it is often said that much and many are used for questions, we usually use them for questions which expect a negative response. For example:
- Do you want a lot of pizza? (I expect you want to eat a lot)
- Do you want much pizza?  (This sounds as though I expect you don't want to eat much)

How much / many?

How much is used to ask about quantity or to ask the price of something. For example:

-How many apples does he have?
- How much is it?


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