Sentence Diagramming: Flashcard 5
A predicate nominative is a noun, pronoun, or equivalent expression* that follows a linking verb and refers to the subject of the sentence. A predicate adjective is an adjective or equivalent expression** that follows a linking verb and refers to the subject of the sentence. Predicate nominatives and predicate adjectives are sometimes called subjective complements.

A linking verb is a verb that requires a subjective complement for completion. The most common linking verb is be,*** including its many forms such as is, are, was, were, will be, and, has been. Among other verbs that can be linking verbs are seem, become, feel, and remain.

As you make your way through these flashcards, you may wish to refer to a section of my website that deals with terminology, www.german-latin-english.com/diagrammingterms.htm

On the right is a diagram of the sentence "Rodney is a good friend." Friend is a predicate nominative. In the sentence "Rodney is friendly," friendly is a predicate adjective. To diagram this sentence, remove the words a good friend from the diagram at the right and put friendly where friend was. Predicate nominatives and predicate adjectives are diagrammed in the same way: each follows a linking verb on the base line. A backslash separates the verb from the subjective complement. Flashcard 6: direct objects and indirect objects. 
* Equivalent expressions include clauses and phrases and will be discussed later.

** Equivalent expressions include prepositional phrases. More about this later.

*** Some scholars put the verb be in a category of its own.

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