QUESTION: Can we conclude from "People are shopping at a roadside vegetable stand while a bus passes." that "People tell jokes to each other during class."?
Options:
- yes
- no
- it is not possible to tell

Let's solve it slowly: Either they are outside by the roadside or inside in a class. They are either shopping or telling jokes.
The answer is no.

QUESTION: Given the sentence "Brown dog crouching in grass looking up." is it true that "A dog is lying on the sofa."?

Let's solve it slowly: Either the dog is crouching in grass or lying on a sofa. The dog cannot occupy both places at one time.
The answer is no.

QUESTION: Premise: "Man operating a blue forklift."
Hypothesis: "A old man is operating a red forklift."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no

Let's solve it slowly:
A man operating a forklift is not necessarily old. A forklift that is blue is not necessarily red.
The answer is it is not possible to tell.