premise: A skateboard is grinding on a curb with his skateboard.
hypothesis: The skateboard is grinding.
explanation_1: Both skateboard are grinding on the ground.
explanation_2: The skateboard is grinding is part of the description being done with his skateboard.
explanation_3: The skateboard is grinding because it is grinding on a curb.
premise_logic: exists e1 x1 x2 x3.(on(e1,x2) & with(x2,x3) & n_skateboard(x3) & of(x3,x1) & n_male(x1) & n_curb(x2) & Actor(e1,x1) & v_grind(e1) & n_skateboard(x1))
hypothesis_logic: exists e1 x1.(n_skateboard(x1) & Actor(e1,x1) & v_grind(e1))
premise_sim: exists e1 x1 x2 x3.(with(x2,x3) & v_grind(e1) & on(e1,x2) & of(x3,x1) & n_skateboard(x3) & n_skateboard(x1) & n_male(x1) & n_curb(x2) & Actor(e1,x1))
hypothesis_sim: exists e1 x1.(v_grind(e1) & n_skateboard(x1) & Actor(e1,x1))