Premise: Two people rafting down a river, a footbridge in the background.

Hypothesis: Two people are rafting down a dangerous river.
it is not possible to tell

Premise: Three men stand still on a dock next to two boats.

Hypothesis: Two boat captains prepare to fight, egged on by a bystander.
it is not possible to tell

Premise: A man has a racquet in his hand and is playing a game of tennis.

Hypothesis: A man is playing tennis.
yes

Premise: Young father playing with his kids.

Hypothesis: Father playing outdoors with his kids
it is not possible to tell