[Q] Given the sentence "A man in a gray shirt is walking along a path." is it true that "The man in a gray shirt is on a boat."?
[A] One can be either on a boat or walking along a path.
The answer is no.

[Q] Premise: "A bmx biker performing a trick high above the ground with trees covering the background."
Hypothesis: "The biker is performing in a bmx competition."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no
[A] Just because a BMX biker is performing a trick doesn't mean it's in a BMX competition.
The answer is it is not possible to tell.

[Q] Premise: "Two children play street hockey in front of a goal."
Hypothesis: "The two children also enjoy golf."
Do we know that the hypothesis entailed by the premise?
[A] Two children play street hockey in front of a goal does not mean that they also enjoy golf.
The answer is it is not possible to tell.