[Q] Given the sentence "Two men are working with a cement mixer and pouring cement into a hole in a street." is it true that "The cement mixer is being operated by only the two men."?
[A] The cement mixer can have other operators other than the two men.
The answer is it is not possible to tell.

[Q] Can we conclude from "A group of people building a structure are talking." that "A group of people tear down a structure."?
Options:
- yes
- no
- it is not possible to tell
[A] You can't be building a structure and tearing it down at the same time.
The answer is no.

[Q] Given the sentence "A man in midair holding his bike's handlebars." is it true that "The man is putting air in the tires of his bike."?
[A] One cannot be in midair and putting air in the tires simultaneously.
The answer is no.