那个 — how to use it in Chinese

Demonstrative pronoun. Used to refer to something distant or already known in context (more distant than 这个).

那 (nà) is the distal demonstrative ("that"). It combines with the classifier 个 (ge) for people or generic objects. With other nouns, use the appropriate classifier: 那本书 (that book), 那只猫 (that cat). Its opposite is 这个 (zhè ge, "this").