Man and child riding in go-cart.
Two people sitting in a go-cart.
If they are riding in the go-cart, then they must be sitting in it to do so
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x4) & n_go-cart(x4) & n_riding(x1) & of(x1,x3) & n_child(x3) & of(x1,x2) & n_man(x2))
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_go-cart(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))