Premise & hypothesis: Is the premise "A person is doing a trick on a bicycle with grass and sky as the background." true if "A person is practicing for the olympics."?
A: it is not possible to tell

Premise & hypothesis: Is the premise "Yellow barriers are lined up and men are walking on both sides of them." true if "The men are going to work"?
A: it is not possible to tell

Premise & hypothesis: Is the premise "A snowboarder jumps over a ramp on a mountain course." true if "A skier is hesitant at the top of a slope."?
A: no

Premise & hypothesis: Is the premise "A small and gray dog chases a large bull who is jumping away from it." true if "A large and gray dog chases a small bull who is jumping away from it."?
A:
no