In an effort to realize his dream, duncan an aspiring astronaut spends hours studying to prepare for his college entrance exams. retype the sentence in the space below. use all caps to identify the appositive or appositive phrase. punctuate accordingly. write the noun to which the appositive refers below your sentence.

The following is the answer—the retyped sentence as per the directions in the "question".


In an effort to realize his dream, DUNCAN, an aspiring astronaut, spends hours studying to prepare for his college entrance exams.

Answer to the second part of the question:  The noun to which the appositive refers in the above sentence is: "astronaut".

{Additional note: the "appositive" in the [rewritten] sentence is "Duncan".  "Duncan" (name of student and prospective astronaut) is the "appositive"—in the form of an "appositive noun" [as opposed to an "appositive phrase".]}.