a man sitting by the sidewalk runs a violin bow across another flat object.
The man is standing.
The man is either sitting or standing but he can't be doing both.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(n_object(x6) & a_flat(s1) & Theme(s1,x6) & n_sidewalk(x3) & across(e2,x7) & n_object(x7) & a_flat(s2) & Theme(s2,x7) & -(x7 = x6) & Theme(e2,x4) & Actor(e2,x1) & v_run(e2) & n_bow(x4) & of(x4,x5) & n_violin(x5) & by(e1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_stand(e1))