Perfectly good sentence but the Greek did not include the word these. If you wanted an alternative, whose shoes are they, would be nearer to whose are the shoes .

Maybe noy

Πρέπει να συμφωνεί ο αριθμός του ρήματος με τον αριθμό του ουσιαστικού. Για παράδειγμα: -Whose is this pen? -Whose are these pens?