QUESTION: Given the sentence "Two men playing basketball under a blue sky." can we conclude that "The two men are playing on a basketball court."?
Options:
- yes
- it is not possible to tell
- no

Let's solve it slowly: Basketball does not always need to be played on a court.
The answer is it is not possible to tell.

QUESTION: Premise: "People are in a room practicing a martial art."
Hypothesis: "People are in the middle of a martial arts class."
Do we know that the hypothesis entailed by the premise?

Let's solve it slowly: Practicing a martial art in a room together implies that they are in the middle of a martial arts class.
The answer is yes.

QUESTION: Test for natural language inference.
Premise: "An old man is standing in front of an ad on the sidewalk."
Hypothesis: "An man is standing in front of an ad on the sidewalk."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell

Let's solve it slowly:
An old man is a man as part of his description on the sidewalk.
The answer is yes.