QUESTION: Premise: "A boy punching with a spray of snow."
Hypothesis: "A boy is having a snowball fight."
Do we know that the hypothesis entailed by the premise?

Let's solve it slowly: Not all boy punching with a spray of snow having a snowball fight.
The answer is it is not possible to tell.

QUESTION: Premise: "Young adults have barbecue in the park."
Hypothesis: "The young adults are celebrating july 4th."
Do we know that the hypothesis entailed by the premise?

Let's solve it slowly: Celebrating July 4th is not the only occasion when young adults can have a barbecue in the park.
The answer is it is not possible to tell.

QUESTION: Given the sentence "Mom and her son put together a wooden track for cars." is it true that "Mom and son indoors."?

Let's solve it slowly:
Mom and son can put together a wooden track for cars anywhere and not necessarily only indoors.
The answer is it is not possible to tell.