[Q] Given the sentence "A brown dog is jumping after a tennis ball." is it true that "A dog is eating a tennis ball for breakfast."?
[A] The dog cannot be eating a tennis ball if it is jumping to retrieve the ball.
The answer is no.

[Q] Given the sentence "A man laying in the middle of the sidewalk near a busy city street." is it true that "The man laying in the middle of the sidewalk is near a busy street filled with busses."?
[A] A man near a busy city street is not necessarily a street filled with busses.
The answer is it is not possible to tell.

[Q] Premise: "A young boy jumping into a pool that says ""no diving""."
Hypothesis: "A sad young boy jumping into a pool that says something about safety."
Do we know that the hypothesis entailed by the premise?
[A] Just because young boy jumping into a pool that says 'no diving' doesn't mean he is sad.
The answer is it is not possible to tell.