Form-Function Diagram: A tall kid ate some apples.

In the sentence A tall kid ate some apples, the noun phrase a tall kid functions as the complete subject. The adjective and adjective phrase tall functions as a noun phrase modifier of the noun kid. The noun kid functions as the simple subject. The definite article the functions as the determinative of the noun kid. The verb phrase ate some apples functions as the complete predicate. The verb ate functions as the simple predicate. The noun phrase some apples functions as the direct object. The quantifier some functions as the determinative of the noun apples, which functions as the direct object.

A form-function diagram is a visualization of the layers of grammar. The top identifies forms, or what words, phrases, and clauses look like. The bottom identifies functions, or what words, phrases, and clauses do. For more information about form-function diagrams, see A Form-Function Description of the Grammar of the Modern English Language: Book 1 (Level 9A) (A Form-Function English Grammar) and A Form-Function Description of the Grammar of the Modern English Language: Book 2 (Level 9B) (A Form-Function English Grammar).