A surfer cutting up some waves.
A surfer is sitting on his surfboard on the beach.
The surfer cannot be surfing and sitting on the beach at the same time.
exists e1 s1 x1 x2 x3.(a_topic(x1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_cut(e1) & n_wave(x3) & (x1 = x2) & n_surfer(x1))
exists e1 x1 x2 x3.(n_beach(x3) & on(e1,x3) & on(e1,x2) & n_surfboard(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_sit(e1) & n_surfer(x1))