Student asked: Premise: "A man in a green shirt directs trucks in preparation of the racetrack."
Hypothesis: "A man is directing trucks to staging areas on the racetrack so that the race can begin."
Do we know that the hypothesis entailed by the premise?
Teacher's response: Let's think. Preparation of a racetrack may describe a very large number of actions before the staging of vehicles. The answer is it is not possible to tell.

Student asked: Can we conclude from "A lady with blond-hair is walking briskly down the street." that "A blond is walking fast to get somewhere."?
Options:
- yes
- no
- it is not possible to tell
Teacher's response: Let's think. Not all lady is a blond. Walking briskly is not necessarily walking fast to get somewhere. The answer is it is not possible to tell.

Student asked: Can we conclude from "A group of people stare at a building." that "A group of people are waiting for the building to open."?
Options:
- yes
- no
- it is not possible to tell
Teacher's response: Let's think. People staring at the building does not imply they are waiting for it to open. The answer is it is not possible to tell.

Student asked: Can we conclude from "A man and a woman stand at a street vendor's food stand." that "A man and his son are at the food stand."?
Options:
- yes
- no
- it is not possible to tell
Teacher's response:
Let's think. Either a man and woman are at the stand or a man and his son are. The answer is no.