thumb|A generative parse tree: the sentence is divided into a noun phrase (subject), and a verb phrase which includes the object. This is in contrast to structural and functional grammar which consider the subject and object as equal constituents. Frameworks of grammar which seek to give a precise scientific theory of the syntactic rules of grammar and their function have been developed in theoretical linguistics.
thumb|A generative parse tree: the sentence is divided into a noun phrase (subject), and a verb phrase which includes the object. This is in contrast to structural and functional grammar which consider the subject and object as equal constituents. Frameworks of grammar which seek to give a precise scientific theory of the syntactic rules of grammar and their function have been developed in theoretical linguistics.