How does this sentence demonstrate an unusual use of syntax?

the party is when? (4 points)

it is not a complete sentence.
the traditional order of the sentence is inverted, or reversed.
the subject is located before the predicate.
it ends with a question mark but is not actually a question.

The sentence demonstrates an unusual use of syntax because the traditional order of the sentence is inverted, or reversed. The traditional order of the sentence is subject-verb-object. In an interrogative sentence, the wh word is the missing information. This missing information is the object in the sentence. The wh words always take the place of the subject. Therefore, correct sentence should be, "When is the party?".