A male fire-dancer performs.
The male is swimming in the lake.
If a male is performing as a fire-dancer, he is not swimming in the lake.
exists s1 x1 x2.(a_topic(x1) & n_perform(x1) & of(x1,x2) & n_fire-dancer(x2) & a_male(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_lake(x2) & n_male(x1) & in(e1,x2) & Actor(e1,x1) & v_swim(e1))