Man and his son wave as they ride a small train.
A family is eating at a restaraunt.
Ride a small train and eating at a restaurant are not the same.
exists p1 s1 x1 x2.(a_topic(s1) & subset_of(x2,s1) & exists e1 s2 x3 x4.(Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_train(x4) & a_small(s2) & Theme(s2,x4) & as(x3,x1) & n_wave(x3)) & n_thing(x1) & that(x2,p1) & n_son(x2) & of(x2,x1) & n_male(x1) & subset_of(x1,s1) & n_man(x1))
exists e1 x1 x2.(at(e1,x2) & n_restaraunt(x2) & Actor(e1,x1) & v_eat(e1) & n_family(x1))