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:

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.
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:

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.
assistant
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:

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.