Generally, indefinite articles (a, an) are used with countable nouns while the definite article (the) is normally applied with uncountable nouns. However, they can be used with both countable or uncountable nouns in some cases. In this part, the use of articles (a, an, the) for both countable and uncountable nouns is presented:

1. countable nouns: use with articles

A countable noun is something you can count: 30 books, many manuscripts, 100 apples, several PCs.