I'll give you a question, please answer with step-by-step reasoning process.
Premise: "A boy doing a skateboarding trick on a city sidewalk."\nBased on this premise, can we conclude that the hypothesis "A boy is trying to grind on a rail." is true?\nOptions:\n- yes\n- it is not possible to tell\n- no

it is not possible to tell
The boy could be doing other tricks besides trying to grind.

.

Thus, the answer is it is not possible to tell