A man in a white shirt is fixing the tire of a crimson bike.
Nobody is fixing
sentence two can not say nobody is fixing if a man is fixing the tire in sentence one
exists e1 s1 x1 x2 x3 x4 x5.(n_tire(x3) & Theme(e1,x3) & Actor(e1,x1) & v_fix(e1) & of(x3,x4) & n_bike(x4) & of(x4,x5) & n_crimson(x5) & in(x1,x2) & n_shirt(x2) & a_white(s1) & Theme(s1,x2) & n_man(x1))
-exists e1 x1.(Actor(e1,x1) & v_fix(e1) & n_person(x1))