* Double Negative: "Never" and "nobody" are both negative words. Using them together creates a double negative, which makes the sentence illogical. You're essentially saying Debbie *does* talk to someone.
* Subject-Verb Agreement: The subject "Debbie" is singular, but the verb "talk" is in the plural form. The correct verb form is "talks".
Here's how to correct the sentence:
* Debbie never talks to anyone in the class.
* Debbie doesn't talk to anyone in the class.
* Debbie never speaks to anyone in the class.
These options use only one negative word and have the correct subject-verb agreement.