Student asked: Given the sentence "Two men wearing white suits play guitar on stage." is it true that "Two men are playing in a rock concert."?
Teacher's response: Let's think. Two men playing guitar on stage are not necessarily playing a rock concert. The answer is it is not possible to tell.

Student asked: Can we conclude from "The black boy in the gray t-shirt is shaking his hands." that "The boy is holding his hands still."?
Options:
- yes
- no
- it is not possible to tell
Teacher's response: Let's think. Either his hands are shaking or they are still it would be either one or the other. The answer is no.

Student asked: Premise: "This person is performing a trick in skateboarding competition."
Hypothesis: "With people watching in the background."
Do we know that the hypothesis entailed by the premise?
Teacher's response: Let's think. A man is using his skateboard to perform a trick in front of a crowd. The answer is it is not possible to tell.

Student asked: If "A chubby man rides away down the street on a bike." does that mean that "A chubby man rides away on a bicycle."?
Options:
- yes
- it is not possible to tell
- no
Teacher's response:
Let's think. Bike and bicycle are used interchangeably as part of the description of chubby man riding away. The answer is yes.