premise: A man, wearing black jeans and a gray shirt, stands in the front of a classroom writing on a chalkboard. hypothesis: He writes important notes for the class.
entailment: if a man is in the front of the classroom writing on a chalkboard, he is probably writing (writes) important notes for the class. if he is in a classroom, this implies there is a class. if he is writing on a chalkboard, that implies he is writing notes for the class. and if he is writing notes for the class, this implies that they are important.