premise: A man is holding a book standing in front of a chalkboard. hypothesis: A person is in a classroom teaching.
entailment: The person holding book standing in front if the chalkboard is teaching.|entailment: The person standing at the front of a classroom is generally understood to be teaching the class.|entailment: A man who is a person, is holding a book standing in front of a chalkboard which implies he is in a classroom environment ans possibly even the teacher.