This document provides notes on using counters in Japanese grammar. It explains that different counters are used for different types of items, and that counters typically come after the number and item being counted, rather than before. It introduces the counters mai for counting pieces of clothing, hon for counting bottles, and kai for counting floors of a building. It also notes the traditional Japanese way of counting small items without a counter by using words like hitotsu for one and futatsu for two up to ten.