A surfboarder catches the waves.
a surfboarder in the water
A surfboarder has to be in the water to catch the waves.
exists e1 x1 x2.(n_wave(x2) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_surfboarder(x1))
exists x1 x2.(n_water(x2) & a_topic(x1) & in(x1,x2) & n_surfboarder(x1))