Question

A subject can be

singular - e.g. a pen, a body, a box plural - e.g. children, plates, boxes uncountable - e.g. furniture, sugar

Therefore, all nouns can be either

or

 

Answer 1

Therefore, all nouns can be either countable or uncountable (with uncountable nouns further divided into non-count/non-mass nouns like machinery and mass nouns like coffee, coal, sugar).