The verb in the sentence is "plans." It indicates Aaron's intention or future action regarding attending college after completing the course workbook.
In American English, question marks typically go inside quotation marks if the quoted material itself is a question. For example: He asked, "Are you coming?" However, if the entire sentence is a question but the quoted material is not, the question mark goes outside the quotation marks, as in: Did she really say, "I will not attend"?
The word "what" is a pronoun, whether used as an interrogative (What are you doing) or object (Listen to what I say). It can also be an adjective (what school do you attend), and more dubiously as an adverb or conjunction. It is, however, never a verb.
Aaron plans to attend college once he completes this workbook?
Where did you attend college? (You did attend college where?)where - adverb, modifies the verb 'did attend';did - auxiliary verb;you - personal pronoun, subject of the sentence;attend - main verb;college - noun, direct object of the verb 'did attend'.
What college did he attend? (He did attend what college?)what - interrogative pronoun, functioning as a determiner;college - noun, direct object of the verb 'did attend';did - auxiliary verb;he - personal pronoun, subject of the sentence;attend - main verb.
So you can learn how to write a proper sentence.
When deciding where to attend college, she asked her friends and family for advice.
Through work and determination, I was able to get several scholarships to attend college.
did not attend college
He did not attend college.
I'm going to attend college next semester.this semester is gonna be fun!
Beethoven did not attend college, but his father did; he attended the Jesuite College.
Chris Osgood did not attend college.
Marie Antoinette did not attend college.