When used adverbially, the word 'fast' tends to modify verbs rather than nouns.

The adverbialness of the clause puzzled several of the graduate students during the syntax seminar.

Linguists debated the adverbiality of the phrase before deciding how to annotate it.

Writers often adverbialize adjectives to give their prose a more lyrical rhythm.

The linguistics professor included several adverbializations in the lecture to show how adjectives can be turned into adverbs.

The linguist explained how adverbialization can change a clause's function in a sentence.

The linguistics professor explained the adverbial function of the clause in today's lecture.

In the sentence 'She left in the morning,' 'in the morning' functions as an adverbial.

Writers often find themselves adverbializing adjectives to capture subtle nuances of tone.

The poet adverbialized the phrase to emphasize the action's manner.