Concerning my past question, is "working" the only word in the gerund phrase and my teacher said that it "working" wasn't a DO. No one in my class could figure out the answer.

the word "Working" is a verb.

-Verb is a doing (Action) word.

To determine whether "working" is the only word in the gerund phrase and whether it functions as a direct object (DO) in the sentence, let's break down the sentence and analyze it.

First, let's identify the gerund phrase. A gerund is a verb form ending in "-ing" that functions as a noun. In your sentence, the gerund phrase is "working hard" because "working" ends in "-ing" and functions as a noun by acting as the object of the preposition "on."

Now let's assess whether "working" is the only word in the gerund phrase. The word "hard" is also part of the gerund phrase. It acts as an adverb modifying the gerund "working" to describe how you are working. So, the gerund phrase in your sentence is "working hard."

Next, we need to determine whether "working" is a direct object in the sentence. A direct object follows a transitive verb and directly receives the action of the verb. In your sentence, the verb is not explicitly mentioned. However, we can assume that it is implied, like "I am working hard." In this case, "working" is not a direct object because it is not receiving the action of the verb. Instead, it is acting as the object of the preposition "on."

To summarize, the gerund phrase in your sentence is "working hard" because it includes both "working" and "hard." However, "working" is not a direct object in the sentence; it functions as the object of the preposition "on."