Leo: Given the sentence "A young girl riding a surfboard." is it true that "There are no people surfing today."?
Mei: OK, So, let's think first...
Me:

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
Either the girl is riding or there are no people surfing.
Thus, the answer is no.