Q: Premise: "A boy doing a skateboarding trick on a city sidewalk."
Based on this premise, can we conclude that the hypothesis "A boy is trying to grind on a rail." is true?
Options:
- yes
- it is not possible to tell
- no
A: The boy could be doing other tricks besides trying to grind.
The answer is it is not possible to tell.

Q: Given the sentence "The bears seem to have a friendly or familiar relationship." can we conclude that "The bears do not like each other."?
Options:
- yes
- it is not possible to tell
- no
A: Bears that do not like each other are not in a friendly relationship.
The answer is no.

Q: Premise: "A man with a mustache and wearing a gray sweater sits in front of an old style computer."
Hypothesis: "A man with a mustache uses a computer."
Do we know that the hypothesis entailed by the premise?
A: If someone sits in front of a computer then someone is likely working on the computer.
The answer is yes.

Q: Can we conclude from "Performers in costumes are performing at a parade." that "The performers are naked."?
Options:
- yes
- no
- it is not possible to tell
A:
If they are in costumes then they would not be naked you cannot be both simultaneously.
The answer is no.