Premise: Man surfing at the beach.

Hypothesis: A guy is surfing and gets knocked over by a wave.
it is not possible to tell

Premise: Children are preparing for a play on stage.

Hypothesis: Some professional ballerina dancers are getting ready for the show.
no

Premise: A blue boat moves down a canal lined with red, orange and white homes.

Hypothesis: a sailboat sinks.
no

Premise: Businessman, security and Amish men talk in the city.

Hypothesis: At least three men are conversing.
yes