QUESTION: Premise: "A man is a white sweater is sitting at a desk using a computer."
Hypothesis: "He is working."
Do we know that the hypothesis entailed by the premise?

Let's solve it slowly: Just because he' s sitting at a desk using a computer does not mean he's necessarily working.
The answer is it is not possible to tell.

QUESTION: Given the sentence "Several tables are set up with produce on them." is it true that "The tables are empty."?

Let's solve it slowly: The tables cannot be empty if they have produce on them.
The answer is no.

QUESTION: Premise: "Two dog play with ball while one makes a big jump."
Hypothesis: "One dog plays while another dog jumps over a ball."
Do we know that the hypothesis entailed by the premise?

Let's solve it slowly:
The dog jumping does not necessarily make its jump over a ball.
The answer is it is not possible to tell.