By 36–60 months, phonological awareness continues to improve as well as pronunciation. At this age, children have a considerable experience with language and are able to form simple sentences that are 3 words in length. They use basic prepositions, pronouns, and plurals. They become immensely creative in their language use and learn to categorize items such as recognizing that a shoe is not a fruit. At this age, children also learn to ask questions and negate sentences to develop these questions. Over time, their syntax gets more and more unique and complex. A study reveals that at this age, a child's speech should be at least 75% intelligible.