Father is pushing his son on the track.
Two people are near a track.
A Father and a son are two people.
exists e1 x1 x2 x3.(n_track(x3) & n_son(x2) & of(x2,x1) & n_male(x1) & ne_nam_father(x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_push(e1))
exists p1 x1.(exists x2.(near(x1,x2) & n_track(x2)) & n_people(x1) & card_eq_2(x1))