[Q] Given the sentence "A man is giving a presentation to a room full of people." is it true that "A man in standing inside of a building."?
[A] The man is in a room so he must be inside a building.
The answer is yes.

[Q] Given the sentence "She sits alone on the city bus while a man reads his newspaper behind her." is it true that "There are people on a bus."?
[A] A man and she implies that there are people on a bus.
The answer is yes.

[Q] Premise: "A group of young men are about to play soccer on a sandy plain."
Hypothesis: "A group of young men are standing on a sandy plain."
Do we know that the hypothesis entailed by the premise?
[A] Men about to play on a sandy plain are standing on a sandy plain.
The answer is yes.