... make uncountable nouns countable to express quantity We add a unit or a quantity with “OF” A can of coke A bag of flour A box of cereals A) Countable or uncountable? Write the following nouns ... “smoke”, but not “ one smoke” or “two rices” Uncountable nouns are only singular , and we cannot use a / an with them smoke We often use an uncountable noun (without a / an) to say something is ... three pens We use a / an only before singular countable nouns (A/An is bit like one: you can´t say one pencils or one smoke.) a pencil UNCOUNTABLE NOUNS Are words like smoke, rice, water, petrol...