premise: Girl wearing white shirt sings on stage while playing guitar. hypothesis: A girl plays guitar and sings on stage.
entailment: To "plays guitar and sings" implies that the singing is being done simultaneously while playing guitar.|entailment: A girl plays guitar and sings is a rephrasing of girl sings while playing guitar.|entailment: Girl wearing white shirt sings on stage while playing guitar means girl plays guitar and sings on stage.