Student: Given the sentence "The boy is performing a trick on a red rail with a skateboard." is it true that "He is a beginner."?.
Teacher: Let's think:

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
The boy performing a trick on a red rail with a skateboard is not necessarily a beginner. So the final answer is it is not possible to tell.