When studying languages, students learn characters and words in the beginning. After that, they also have to memorize complicated sentence patterns. However, even if you use only one word you can communicate with people. For instance, if an infant says “milk,” his/her parents understand that he/she wants milk. By gradually learning new words, the infant is able to express their desires more clearly, for instance, “cold milk.” As time goes by, they can add more words to form natural sentences.