 Words aren't combined randomly to form sentences. They follow a hierarchical structure which can be represented as a syntactic tree. The major nodes of a syntactic tree are called phrases. Each of these phrases have a head, and the word class of the head determines what type of phrase they are. Adjectival phrase, noun phrase, adverb phrase, prepositional phrase, or verb phrase. Each node in a tree is attached to something higher up, and nodes should only branch in a binary fashion. Let's draw a syntactic tree. The first step is to define the word class of the terminal nodes. Next, we can group these words into phrases by working from the bottom up. Student branches to N-bar, an intermediate node, and finally to noun phrase, with the in a specified position. Since linguistics is a noun, it also branches up to the N-bar and finally noun phrase. Now only studies is left. The inflection for tense and person S can be placed under the inflection node, while the verb study goes under the V-bar. The intermediate node V-bar links together with the noun phrase linguistics to create the verb phrase, and the syntactic tree for the sentence is created.