Adverbial complements always appear after the verb they complement. If the verb is intransitive, the complement will appear directly after the verb; if the verb is transitive, the complement will appear after the verb's direct object. ... Yes—the adverbial is a complement.

Can adverbs be subject complement?

(Issue 1) Don't use an adverb as a subject complement.

A subject complement is an adjective, noun, or pronoun. It's never an adverb.

Are adverbs adjuncts or complements?

Complements are structurally indispensable in a sentence whereas adjuncts are structurally dispensable in a sentence. Adjuncts are always adverbial but complements can be nouns or adverbs.