premise: A person on a boat by the shore.
hypothesis: A guy is on a boat by the shore fishing.
explanation_1: A person can be something other than a guy. A person on a boat may be doing something other than fishing.
explanation_2: People could be riding the boat for fun and not fishing in sentence one. "Person" could be a guy or girl.
explanation_3: Not all people are a guy.
premise_logic: exists x1 x2 x3.(n_shore(x3) & a_topic(x1) & on(x1,x2) & by(x2,x3) & n_boat(x2) & n_person(x1))
hypothesis_logic: exists p1 x1 x3 x4.(n_fishing(x3) & of(x3,x4) & n_shore(x4) & exists x2.(on(x1,x2) & by(x2,x3) & n_boat(x2)) & n_guy(x1))