Student asked: Premise: "A utility worker in a hydraulic lift bucket is cutting down a tree."
Hypothesis: "A man uses a chainsaw to fell an oak."
Do we know that the hypothesis entailed by the premise?
Teacher's response: Let's think. The tree the man is cutting may not specifically be an oak tree. The answer is it is not possible to tell.

Student asked: Premise: "A group of twenty or so people posing for a picture."
Hypothesis: "People are standing together."
Do we know that the hypothesis entailed by the premise?
Teacher's response: Let's think. A group of twenty or so people are standing together and posing for a picture. The answer is yes.

Student asked: Premise: "Man taking a picture in a crowd of people."
Based on this premise, can we conclude that the hypothesis "The man is taking a picture of a giraffe." is true?
Options:
- yes
- it is not possible to tell
- no
Teacher's response: Let's think. The man can't take a picture of a giraffe if he's taking a picture in a crowd of people. The answer is no.

Student asked: Premise: "Guy jumping off a surfboard at some kind of event."
Hypothesis: "The surfer is performing a very hard trick."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no
Teacher's response:
Let's think. The surfer might have slipped or be recovering rather than performing a trick. The answer is it is not possible to tell.