Person snowboarding down a snow covered slope.
the surfboad  was  lost  in  the water.
You cannot go snowboarding on a surfboard
exists e2 e1 s1 x1 x2 x3.(ne_nam_person(x1) & a_down(s1) & Manner(e2,s1) & Theme(e2,x2) & Actor(e2,x1) & v_snowboard(e2) & n_slope(x2) & Theme(e1,x2) & v_cover(e1) & of(x2,x3) & n_snow(x3))
exists e1 x1 x2.(n_water(x2) & n_surfboad(x1) & in(e1,x2) & Theme(e1,x1) & v_lose(e1))