QUESTION: Premise: "A man in a kayak resting on top of a diving board."
Hypothesis: "A man plays chess with his son."
Do we know that the hypothesis entailed by the premise?

Let's solve it slowly: A kayak cannot be on a diving board. One does not play chess in a kayak or on a diving board.
The answer is no.

QUESTION: Test for natural language inference.
Premise: "A skater practices his moves on a sunny day near the water."
Hypothesis: "There is someone watching others skate."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell

Let's solve it slowly: He would not be watching others skate if he was practicing moves as he would be focused on himself.
The answer is no.

QUESTION: Can we conclude from "A mountain biker is riding on a marked out competition trail in the woods." that "A mountain biker races through the woods."?
Options:
- yes
- no
- it is not possible to tell

Let's solve it slowly:
A trail in the woods presumably also goes through the woods.
The answer is yes.