A surfer catches a large wave.
The person is surfing today.
A surfer is a person, and catches a large wave means surfing.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_wave(x2) & a_large(s1) & Theme(s1,x2) & n_surfer(x1))
exists e1 x1 x2.(n_person(x1) & Time(e1,x2) & n_today(x2) & Actor(e1,x1) & v_surf(e1))