A child putting on a bicycle helmet.
man eats chips
The subject is a child, not a man and he cannot be putting on a bicycle helmet at the same time he eats chips.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_helmet(x3) & of(x3,x4) & n_bicycle(x4) & Actor(e1,x2) & v_put(e1) & (x1 = x2) & n_child(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_chip(x2) & n_man(x1))