I don't understand the grammar in this question:
Doesn't Denise do enough talking already?
I know gerunds can be used with some verbs, as a subject. But in this sentence, I don't know why a gerund is used or if it can be written in another way.
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Let's just use a statement as an example, OK? This isn't about questions.
The do ... talking constitutes a light verb construction, using the pro-verb do, with the actual meaningful verb demoted to a nominal direct object. This works with any active verb
The noun object doesn't have to be formed with -ing, though those nouns usually work fine if the verb is active; however, any noun that refers to an activity will work.
Do (often in the form do it) is the pro-verb for active verbs (this is not the same do as the Do-Support do, which applies to any verb, active or stative), and is often used alone when the activity is already the subject of conversation.
So the do .. NP construction is pretty common, and plenty of active noun phrases are formed from -ing participles. These aren't gerunds, though, because gerunds can have objects and can't have articles.