not yet learned (for example, someone is a cooker rather than a chef because a child may not know what a chef is). Children can also understand metaphors. From 6–10 years, children can understand meanings of words based on their definitions. They also are able to appreciate the multiple meanings of words and use words precisely through metaphors and puns. Fast mapping continues. Within these years, children are now able to acquire new information from written texts and can explain relationships between multiple meaning words. Common idioms are also understood. Syntactic development The development of syntactic structures follows a particular pattern and reveals much on the nature of language acquisition, which has several stages. According to O'Grady and Cho (2011), the first stage, occurring between the ages of 12–18 months, is called "one-word stage." In this stage, children cannot form syntactic sentences and therefore use one-word utterances called "holophrases" that express an entire sentence. In addition, children's comprehension is more advanced than their production abilities. For example, a child who wants candy may say "candy" instead of expressing a full sentence. The following stage is the "two-word stage" in which children begin to produce "mini-sentences" that are composed of two words, such as "doggy bark" and "Ken water" (O'Grady & Cho, 2011, p. 346). At this stage, it is unclear whether children have an understanding of underlying rules of the language such as syntactic categories, since their "mini-sentences" often lack distinction between the categories. However, children do exhibit sensitivity to sentence structures and they frequently use appropriate word order. After several months of speech that is restricted to short utterances, children enter the "telegraphic stage" and begin to produce longer and more complex grammatical structures (O'Grady & Cho, 2011, p. 347). This stage is characterized by production of complex structures as children begin to form phrases consisting of a subject and a complement in addition to use of modifiers and composition of full sentences. Children use mostly content words and their sentences lack function words. For example, a child may say "fill cup water," instead of saying, "Fill my cup with water." Subsequently, language acquisition continues to develop rapidly and children begin to acquire complex grammar that shows understanding of intricate linguistic features, such as the ability to switch the position of words in sentences. Throughout the process of syntactic development, children acquire and develop question structures. According to O'Grady