A man is kayaking in rough water.
A man is riding a train.
A man cannot be kayaking in water and riding a train at the same time.
exists e1 s1 x1 x2.(in(e1,x2) & n_water(x2) & a_rough(s1) & Theme(s1,x2) & Actor(e1,x1) & v_kayake(e1) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_train(x2) & n_man(x1))