Japanese nouns have no grammatical number, gender or article aspect. The noun hon (本) may refer to a single book or several books; hito (人) can mean “person” or “people”; and ki (木) can be “tree” or “trees”. Where number is important, it can be indicated by providing a quantity (often with a counter word) or (rarely) by adding a suffix. Words for people are usually understood as singular. Thus Tanaka-san usually means Mr./Ms. Tanaka. Words that refer to people and animals can be made to indicate a group of individuals through the addition of a collective suffix (a noun suffix that indicates a group), such as -tachi, but this is not a true plural: the meaning is closer to the English phrase “and company”. A group described as Tanaka-san-tachi may include people not named Tanaka. Some Japanese nouns are effectively plural, such as hitobito “people” and wareware “we/us”, while the word tomodachi “friend” is considered singular, although plural in form.
