A surfer is riding numerous waves.
A snowboarder carves down the mountain.
surfer ride the waves while snowboarder ride in the snow.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_wave(x2) & a_numerous(s1) & Theme(s1,x2) & n_surfer(x1))
exists e1 x1 x2.(n_mountain(x2) & down(e1,x2) & Actor(e1,x1) & v_carve(e1) & n_snowboarder(x1))