This document discusses the WH questions "why" and "when" and provides examples of their use. Why is used to ask for a reason and follows the formula "Why + auxiliary verb + subject + object/complement". When is used to ask about time and follows the formula "When + auxiliary verb + subject + object/complement". Examples are given of why ("Why do you come late?") and when ("When do you go to school?"). Multiple choice questions are then provided to test distinguishing between why and when.