Q: Given the sentence "A woman is waiting alone outside while a bird walks behind her." is it true that "Someone is at a bus stop."?
A: A woman could be waiting outside for something/someone other than a bus.
The answer is it is not possible to tell.

QUESTION: Test for natural language inference.
Premise: "A man and woman standing face to face by a statue."
Hypothesis: "A man and a woman are about to kiss in front of a statue depicting a romantic scene."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell

Let's solve it slowly: A man and women standing face to face may be about to kiss or fight. The statue may be depicting a romantic scene or a war scene.
The answer is it is not possible to tell.

[QUESTION] Can we conclude from "Three people are standing at a concession stand outside." that "Nobody is at the concession stand."?
Options:
- yes
- no
- it is not possible to tell
Either there is nobody there or there are three people there. It can't be both simultaneously.
The answer is no.

Q: Can we conclude from "Young woman celebrating her graduation." that "A girl overjoyed at her graduation."?
Options:
- yes
- no
- it is not possible to tell
A: The woman is celebrating her graduation and that's why she's overjoyed.
The answer is yes.

QUESTION: Can we conclude from "As the camera looks out from a car window." that "Men put out a fire in a pickup truck by the side of the road."?
Options:
- yes
- no
- it is not possible to tell

Let's solve it slowly: The camera looks out from a car window as men sit around a fire cooking marshmallows.
The answer is no.

QUESTION: Can we conclude from "A motorcyclist rides." that "The motorcycle was parked on the sidewalk."?
Options:
- yes
- no
- it is not possible to tell

Let's solve it slowly:
A motorcycle cannot be parked at the same time it rides.
The answer is no.