premise: A boy surfs.
hypothesis: A boy is surfing.
explanation_1: Surfs is the same as is surfing.
premise_logic: exists e1 x1.(Actor(e1,x1) & v_surf(e1) & n_boy(x1))
hypothesis_logic: exists e1 x1.(Actor(e1,x1) & v_surf(e1) & n_boy(x1))
premise_sim: exists e1 x1.(v_surf(e1) & n_boy(x1) & Actor(e1,x1))
hypothesis_sim: exists e1 x1.(v_surf(e1) & n_boy(x1) & Actor(e1,x1))