An adjective in the appositive position is often called an appositive adjective ([§ 172]). “A sword, keen and bright, flashed from the soldier’s scabbard.”

MODIFIERS OF THE PREDICATE

474. The simple predicate, being a verb or verb-phrase, can have only adverbial modifiers.

The simple predicate may be modified by (1) an adverb, an adverbial phrase, or an adverbial clause, (2) an infinitive, (3) an adverbial objective, (4) a nominative absolute, (5) an indirect object, (6) a cognate object.

I. ADVERB, ADVERBIAL PHRASE, ADVERBIAL CLAUSE

475. The simple predicate may be modified by an adverb, an adverbial phrase, or an adverbial clause.

In each of these groups, the simple predicate of the first sentence is modified by an adverb, that of the second by an adverbial phrase, and that of the third by an adverbial clause.

Most adverbial phrases are prepositional ([§ 42]).

AdverbAdverbial Phrase
speedilywith speed
furiouslywith fury
latelyof late
instantlyin an instant
therein that place
rapidlyat a rapid rate
skillfullyin a skillful manner
with skill
promptlyon the instant
to-morrowon the morrow
unwillinglyagainst my will