Locate the complete infinitive phrase and identify its use. The children were asked to play quietly

Infinitive phrase: to play quietly

Use: direct object

Explanation:

A infinitive phrase consists of a full or bare infinitive verb which is usually followed by a complement and a modifier.

In this case, the infinitive phrase to play is succeeded by the adverb quietly, which functions as a modifier. Besides, infinitive phrases can act as nouns, objects and complements. In the example sentence, the infinitive phrase to play quietly works as the direct object of the passive verb were asked.

to play (functions as a direct object)