This document discusses countable and uncountable nouns. It provides examples of singular nouns like "a box of cake" and their plural forms, such as "some boxes of pizza". The document also gives examples of countable nouns including "potato", "glass", and "wish" and shows their plural versions "potatoes", "glasses", and "wishes". It concludes by reminding the reader that singular nouns become plural by adding -s or changing the word, such as potato to potatoes.