A repairman is working on a train.
A man is painting his bedroom.
The man cannot be working on a train and painting his bedroom at the same time
exists e1 x1 x2.(on(e1,x2) & n_train(x2) & Actor(e1,x1) & v_work(e1) & n_repairman(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_paint(e1) & n_bedroom(x2) & of(x2,x1) & n_male(x1) & n_man(x1))