Question and answer: Q: Given the sentence "A man without a shirt is working on the roof of a house." is it true that "A shirtless man is hammering shingles on the roof a house."?
A: it is not possible to tell
Explanation: Working on the roof of a house does not always mean hammering shingles.

Question and answer: Q: Given the sentence "Two young men are playing guitars in the corner of a room." can we conclude that "There were five young men playing drums."?
Options:
- yes
- it is not possible to tell
- no
A: no
Explanation: The same subjects cannot be both two men and five men.

Question and answer: Q: Test for natural language inference.
Premise: "A couple is standing against a railing looking at a beautiful lake and sunset."
Hypothesis: "The couple is in love."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell
A: it is not possible to tell
Explanation:
Not all couple standing against a railing looking at a beautiful lake and sunset is in love.