A man helping a boy ride a bicycle.
An uncle is helping his nephew with his bike.
Not every man with a boy is an uncle and his nephew.
exists x1 x2.(a_topic(x1) & all x3.(n_bicycle(x3) -> exists e1 x4 x5.(Theme(e1,x4) & Actor(e1,x2) & v_help(e1) & for(x4,x3) & n_ride(x4) & of(x4,x5) & n_boy(x5))) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(with(e1,x3) & n_bike(x3) & of(x3,x1) & n_male(x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_help(e1) & n_nephew(x2) & of(x2,x1) & n_uncle(x1))