Student asked: Premise: "A man in khaki walking down a sidewalk."
Based on this premise, can we conclude that the hypothesis "The man is walking by himself." is true?
Options:
- yes
- it is not possible to tell
- no
Teacher's response: Let's think. Not all man in khaki walking down a sidewalk is walking by himself. The answer is it is not possible to tell.

Student asked: Can we conclude from "Grant prepared to hit his golf ball while his caddy and scorekeeper waited for him." that "Grant's caddy hit the grant's shot."?
Options:
- yes
- no
- it is not possible to tell
Teacher's response: Let's think. Grant can't be prepared to take the short while the caddy hit his shot. The answer is no.

Student asked: Given the sentence "A boy in a red sweatshirt pretends to drive a tractor." is it true that "A boy throws a baseball."?
Teacher's response: Let's think. A boy either pretends to drive a tractor or throws a baseball. The answer is no.

Student asked: Given the sentence "A man and a woman walk past a poster of a screaming soccer player." can we conclude that "The man and woman ignored the poster."?
Options:
- yes
- it is not possible to tell
- no
Teacher's response:
Let's think. The man and woman walked past a poster but it was not necessarily ignored by them. The answer is it is not possible to tell.