A man with a ponytail is fixing a bike.
The man is a mechanic.
Just because, a man is fixing a bike does not imply he is a mechanic.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_fix(e1) & n_bike(x3) & with(x1,x2) & n_ponytail(x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists x2.((x1 = x2) & n_mechanic(x2)))