Final answer:
A sentence containing a linking verb indeed has a subject complement, which may be an adjective or a noun phrase that describes or identifies the subject. Linking verbs like seem and become require these complements to complete their meaning.
Step-by-step explanation:
The statement is true: a sentence that contains a linking verb also has a subject complement (predicate noun/adjective). Linking verbs such as seem, look, smell, sound, and become are not complete without a subject complement that further describes or identifies the subject. Examples include 'The soup smells delicious' (smells is the linking verb and delicious is the subject complement adjective) and 'He became a doctor' (became is the linking verb and a doctor is the subject complement noun phrase).
The subject of a sentence is the noun or noun phrase that the sentence is about, while the predicate contains the verb and provides information about the subject. In sentences with linking verbs, the subject complement is a critical component as it either describes the subject's state (with an adjective) or redefines the subject (with a noun).