Student asked: Given the sentence "A boy is standing in the surf at the beach." is it true that "A boy stands at the beach waiting for someone."?
Teacher's response: Let's think. You can stand at a beach and not be waiting for someone. The answer is it is not possible to tell.

Student asked: Premise: "Two people host a concert series."
Hypothesis: "A concert series being hostaged by a crowd of people."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no
Teacher's response: Let's think. A crowd of people refers to more than just two people. The answer is no.

Student asked: Can we conclude from "Three people in a green house." that "Three people are enjoying themselves in a house."?
Options:
- yes
- no
- it is not possible to tell
Teacher's response: Let's think. People in a green house does not imply the people are enjoying themselves. The answer is it is not possible to tell.

Student asked: Given the sentence "A person is jumping on a snowboard on a snowy hill with several trees in the background." is it true that "Someone is riding a snowboard."?
Teacher's response:
Let's think. A person is considered as a someone and jumping on snowboard is done while riding it. The answer is yes.