There are a dozen flowers in the vase. He ate an apple for a snack. Collective nouns are countable. She attended three classes today. London is home to several orchestras .
Some proper nouns are countable.
There are many Greeks living in New York. The Vanderbilts would throw lavish parties at their Newport summer mansion. Uncountable Nouns Uncountable nouns refer to things that we cannot count. Such nouns take only singular form. Abstract nouns are uncountable.