Student asked: Premise: "A female swimmer with goggles and a cap does the backstroke."
Hypothesis: "A female swimmer is taking a break by the pool."
Do we know that the hypothesis entailed by the premise?
Teacher's response: Let's think. Can not be taking a break and doing a backstroke at the same time. The answer is no.

Student asked: Given the sentence "Bicycle sportsman leaps bike in the air on a camping trail." can we conclude that "The sportsman is in a competition."?
Options:
- yes
- it is not possible to tell
- no
Teacher's response: Let's think. Someone who leaps a bike in the air on a trail cannot be assumed to be in a competition. The answer is it is not possible to tell.

Student asked: Test for natural language inference.
Premise: "A man rides a surfboard as a wave comes up behind him."
Hypothesis: "The man is a farmer."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell
Teacher's response: Let's think. Because a person rides a surfboard doesn't mean he is a farmer. The answer is it is not possible to tell.

Student asked: Premise: "A woman is practicing martial arts."
Hypothesis: "A woman prepares for a karate competition."
Do we know that the hypothesis entailed by the premise?
Teacher's response:
Let's think. All women who practice martial arts are not preparing for karate competition. The answer is it is not possible to tell.