Premise: People are wearing bright colored costumes.

Hypothesis: People in fancy dress going to a party
it is not possible to tell

Premise: A woman with a child in her arms and a boy at her side facing towards a body of water.

Hypothesis: A woman is standing outside with her children.
yes

Premise: A mustached man wearing a dark gray shirt plays an accordion.

Hypothesis: A man is playing an electric guitar.
no

Premise: A couple in a red canoe paddle down a rough river lined with trees.

Hypothesis: Wife and husband having a great valentines day.
it is not possible to tell