An employee is vacuuming a building model.
The employee is eating a lobster.
The employee cannot be vacuuming and eating lobster at the same time.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_vacuum(e1) & n_model(x2) & of(x2,x3) & n_building(x3) & n_employee(x1))
exists e1 x1 x2.(n_employee(x1) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_lobster(x2))