premise: A boy on a skateboard in midair
hypothesis: The boy is riding his board.
explanation_1: Answer; The word riding  indicates the boy is in midair
explanation_2: Being on a skateboard means you must be riding a board.
explanation_3: on a skateboard in midair is inferred as riding his board.
premise_logic: exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & in(x2,x3) & n_midair(x3) & n_skateboard(x2) & n_boy(x1))
hypothesis_logic: exists e1 x1 x2.(n_board(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1))
premise_sim: exists x1 x2 x3.(on(x1,x2) & n_skateboard(x2) & n_midair(x3) & n_boy(x1) & in(x2,x3) & a_topic(x1))
hypothesis_sim: exists e1 x1 x2.(v_ride(e1) & of(x2,x1) & n_male(x1) & n_boy(x1) & n_board(x2) & Theme(e1,x2) & Actor(e1,x1))