Premise: A skateboarder with a red hat and green shirt sitting on a skateboard watching other skaters.

Hypothesis: The skateboarder is in a competition.
it is not possible to tell

Premise: You wish your street was as clean as this dudes dirt floor.

Hypothesis: You wish your street walker was as clean as this pimp's dirty ladies.
no

Premise: A man wearing a hat is smiling.

Hypothesis: A man wearing a sombrero is frowning.
no

Premise: The feet are shown of a person who just fell off of their surfboard.

Hypothesis: The person in the picture is playing skee ball.
no