Before choosing many or much, identify how the following noun is used in this sentence. Many goes with plural countable nouns; much goes with uncountable nouns. Whether something can physically be divided into pieces is not enough to decide.
Look at the noun in context
Countable nouns such as apple and chair can use singular and plural forms for separate items. Water, rice and homework are commonly uncountable and do not simply add -s to show quantity.
Some words change their countability with their meaning: chicken can mean an animal or meat. Start with clear examples. For a new use, check a dictionary’s countability label and example sentences.
Choose the quantifier and check the phrase
Use many with a plural countable noun: How many apples are there? Use much with an uncountable noun: How much water is left? Check the form of the noun as well as the quantifier.
In ordinary affirmative sentences, a lot of is often more natural than much: We have a lot of water. Units let us count amounts: a glass of water, two bags of rice. We are counting glasses or bags; water does not become waters just because we use a unit.
Worked example: a class snack
These original questions compare a number of separate items with an amount of liquid.

Find the noun before choosing
Choose many or much. Explain the noun use that supports each answer.
Try it yourself
Pay attention to the noun after the gap.
- How ___ pencils are in the box?
- There is not ___ milk left.
- How ___ bottles of water do we need?
Show an explained answer
- Many pencils: pencils is a plural countable noun.
- Much milk: milk is uncountable here, and this is a negative sentence.
- Many bottles of water: the quantifier belongs with bottles, not directly with water.

