A young man is catching some air while ride a wave board.
A young man is surfing.
catching some air on a wave board means surfing.
exists e1 s1 x1 x2 x3.(while(e1,x3) & (exists x4.(n_board(x3) & of(x3,x4) & n_ride(x4)) | (n_board(x3) & n_wave(x3))) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_air(x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1.(Actor(e1,x1) & v_surf(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))