Question

the dentist recommends flossing every day. subject direct object object of preposition

Explanation:

To determine the role of "flossing" in the sentence "The dentist recommends flossing every day", we analyze the sentence structure. The verb "recommends" is a transitive verb, and the word that receives the action of the verb (what the dentist recommends) is the direct object. "Flossing" is what the dentist recommends, so it functions as the direct object.

Answer:

direct object