Why this matters
Every time you ask for something — food, help, money, advice — you must decide: can I count this thing, or not? English treats these two kinds of nouns very differently. You can say "two apples", but you cannot say "two rices" or "an information". If you use the wrong form, people will still understand you, but your English will sound broken, and in some cases the meaning changes.
This choice touches almost every sentence you say. It decides whether you use "a", "some", "much", or "many". It decides whether the verb is "is" or "are". When you order coffee, ask for directions, or write a work email asking for information, you are using this rule. Learn it once, and hundreds of small decisions become easy.
How it works
Count nouns are things you can count one by one: "one chair, two chairs, three chairs". They have a singular form and a plural form, and in the singular they usually need "a" or "an": "a chair", "an egg". Uncount nouns are things English sees as a mass or an idea, not separate pieces: "water", "rice", "money", "advice", "information", "furniture". They have no plural form, and they never take "a" or "an". You cannot say "a water" or "advices".
The form rules follow from this. With count nouns you can use numbers and "many": "three emails", "many friends". With uncount nouns you use "much" or amount words: "much time", "a little sugar". The word "some" is friendly to both: "some emails", "some sugar". If you want to count an uncount noun, add a container or unit word: "a cup of coffee", "a piece of advice", "two bottles of water". The unit is count; the material stays uncount.
Be careful: whether a noun is count or uncount is about English, not about the real world. Rice is clearly many small pieces, but English calls it uncount. "Furniture" is uncount even though chairs and tables are count. Other languages divide these words differently, so do not translate — learn each common uncount noun as a small fact. The most important ones are: information, advice, news, money, work, homework, luggage, traffic, weather, bread, and furniture.
Some nouns can be both, with a change of meaning. This is the dual-use group. "Coffee" the liquid is uncount ("I drink coffee every day"), but in a café "a coffee" means one cup ("Two coffees, please"). "Chicken" the meat is uncount ("We ate chicken"), but "a chicken" is one whole bird. "Paper" the material is uncount, but "a paper" is a newspaper or a document. Rule of thumb: the material or general idea is uncount; one serving, one unit, or one example of it is count.
When you speak, do a quick check before the noun: can it be "one, two, three ..."? If yes, use "a/an" or a plural. If no, use it bare or with "some", and pick "much", not "many". This one-second check fixes most mistakes.
Examples (15)
1. Could you give me some advice about my visa?
"Advice" is uncount, so we use "some", never "an advice".
2. I bought three tomatoes and some rice.
"Tomatoes" is count with a number; "rice" is uncount with "some".
3. How much money do you need for the trip?
"Money" is uncount, so the question word is "how much".
4. How many chairs are there in the meeting room?
"Chairs" is count, so we ask "how many" and use "are".
5. There isn't much traffic this morning.
"Traffic" is uncount; use "much" in negatives like this.
6. We don't have many eggs left in the fridge.
"Eggs" is count, so the negative uses "many", not "much".
7. Can I have a glass of water, please?
"Water" is uncount, so we count the glass, not the water.
8. She gave me two pieces of useful information.
"Piece of" lets you count the uncount noun "information".
9. Two coffees and an orange juice, please.
In a café, "a coffee" means one cup, so it becomes count.
10. The news is good today.
"News" looks plural but is uncount, so the verb is "is".
11. My luggage was too heavy at the airport.
"Luggage" is uncount; for one item say "a bag" or "a suitcase".
12. Is there any bread for breakfast?
"Any" works with uncount nouns in questions like this one.
13. I have a little time before my next meeting.
"A little" goes with uncount "time"; with count nouns use "a few".
14. We ate chicken and salad at the party.
"Chicken" here is the meat, so it is uncount and has no "a".
15. There's a hair in my soup!
One single hair is count; "hair" on your head is usually uncount.
Common mistakes
The biggest mistake is putting "a" or "an" before an uncount noun, or giving it a plural. Learners say "I need an information" or "She gave me many advices". Both are wrong because "information" and "advice" have no single pieces in English grammar. Say "I need some information" and "She gave me a lot of advice". If you really want to count, borrow a unit: "a piece of information", "two pieces of advice".
The second mistake is mixing up "much" and "many". "How many money do you have?" is wrong because "money" is uncount; say "How much money do you have?". The reverse also happens: "too much people" should be "too many people", because "people" is count. A safe habit: "many" and "a few" go with plurals; "much" and "a little" go with uncount nouns; "a lot of" and "some" go with both.
The third mistake is forgetting that dual-use nouns change meaning. "I ate a chicken" tells people you ate one whole bird — probably not what you meant. "I ate chicken" (no article) means the meat. In the same way, "I found a paper on the floor" means a document, while "I need paper for the printer" means the material. When the noun means the material or the food in general, drop the "a".
Quick tips
- If you can say "two ___s", it is count; if not, it is uncount.
- Never put "a/an" before information, advice, news, money, or furniture.
- "Many" for count nouns, "much" for uncount, "a lot of" for both.
- To count an uncount noun, add a unit: a cup of, a piece of, a bottle of.
- In cafés and restaurants, drinks become count: "two coffees, three teas".
- When unsure in speech, "some" is the safest word — it fits both kinds.