Section 7.4 Heads, Modifiers, and Complements
Every phrase is organized around a head—the central, obligatory element that determines the phrase’s category and core meaning. Other elements are either modifiers (optional elements that add information) or complements (elements that complete the head’s meaning).
Heads.
The head is the word that the phrase is "about." It determines:
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Category: A phrase headed by a noun is a noun phrase; a phrase headed by a verb is a verb phrase
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Core meaning: The head provides the basic meaning; other elements elaborate on it
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Grammatical requirements: The head determines what complements are needed
In the noun phrase “the tall man”, the head is “man”. Without “man”, you don’t have a noun phrase.
In the verb phrase “carefully read the instructions”, the head is “read”. It determines the phrase’s category and requires an object.
Modifiers.
Modifiers are optional elements that add information about the head. They can be removed without making the phrase ungrammatical.
In noun phrases:
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Adjectives: the tall man
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Prepositional phrases: the man in the hat
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Relative clauses: the man who arrived late
In verb phrases:
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Adverbs: she spoke quietly
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Prepositional phrases: she works at a hospital
Modifiers answer questions like "which one?" "what kind?" "how?" "when?" "where?"
Objects and Complements.
Some elements in a phrase do more than modify the head—they complete it. These fall into two categories: objects and complements.
Objects are noun phrases in the verb phrase that receive the action or are directly affected by the verb. Transitive verbs require an object to form a complete thought:
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She read the book. (direct object—what she read)
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The cat chased the mouse. (direct object—what it chased)
Complements in the broader sense are elements that complete the meaning of a linking verb by describing or renaming the subject:
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He is a doctor. (subject complement—a noun phrase renaming the subject)
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She became famous. (subject complement—an adjective phrase describing the subject)
More complex complement patterns (such as verbs that take two objects) will be covered in Chapter 8.
The key difference between objects/complements and modifiers is obligatoriness: if removing an element makes the sentence feel incomplete, it is likely an object or complement rather than a modifier.
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She read the book carefully. → She read the book. (OK—“carefully” is a modifier)
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She read the book carefully. → She read carefully. (Changed meaning—“the book” is an object)
