"on one's classmates" — Kollokationen-Wörterbuch Englisch

on one's classmates Kollokation
Automatische Übersetzung (wir garantieren seine Korrektheit nicht): na czyjś koledzy z klasy
  1. on Präposition + classmate Substantiv
    Schwache Kollokation

    Sometimes she told them, laughing, about jokes she and her friends had played on their classmates.