A man wearing a black shirt vacuums the grass.
The landscaper makes the yard look perfect.
Just because the man is vacuums the grass does not imply he is a landscaper.
exists e1 e2 s1 x1 x2 x3 x4.(n_grass(x4) & Theme(e2,x4) & Actor(e2,x1) & v_vacuum(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_shirt(x3) & a_black(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_look(x2) & of(x2,x3) & n_yard(x3) & n_landscaper(x1) & Theme(e1,x2) & Actor(e1,x1) & v_make(e1) & Time(x2,x4) & n_perfect(x4))