Question and answer: Q: If "The children take a crack at rock climbing." does that mean that "Children are standing next to a rock climbing wall."?
Options:
- yes
- it is not possible to tell
- no
A: it is not possible to tell
Explanation: The children take a crack at rock climbing doesn't imply they are standing next to a rock climbing wall.

Question and answer: Q: Test for natural language inference.
Premise: "A tennis player holds one hand to his mouth and the other holds a racket."
Hypothesis: "A person is holding a racket."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell
A: yes
Explanation: To hold a racket in one hand is a form of holding a racket.

Question and answer: Q: Given the sentence "A man is using a power tool to work on something." can we conclude that "He is fixing a boat."?
Options:
- yes
- it is not possible to tell
- no
A: it is not possible to tell
Explanation:
Using power tools to work on something doesn't mean a boat is being fixed.