A girl is jumping in the air.
The girl is swimming in the lake.
One cannot be swimming and jumping simultaneously.
exists e1 x1 x2.(n_air(x2) & in(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_girl(x1))
exists e1 x1 x2.(n_lake(x2) & n_girl(x1) & in(e1,x2) & Actor(e1,x1) & v_swim(e1))