Please answer the following question by reasoning step-by-step. Given the sentence "A young boy is smiling while standing on a staircase." is it true that "A young boy on a staircase."?. Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Standing on a staircase is a way of being on a staircase. So the answer is yes.