a man stands next to a bus.
A woman is standing next to a imaginary bus.
There can be either a man or woman.
exists e1 p1 x1.(exists s1 x2.(to(s1,x2) & n_bus(x2) & Theme(s1,x1) & a_next(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_stand(e1) & n_man(x1))
exists e1 s1 x1 x2.(to(e1,x2) & n_bus(x2) & a_imaginary(s1) & Theme(s1,x2) & r_next(e1) & Actor(e1,x1) & v_stand(e1) & n_woman(x1))