A mother pushes her young son who is riding a bike.
A mother and son are outside playing.
Riding a bike is usually done outside.
exists e2 e1 s1 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_push(e2) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & (x2 = x3) & n_son(x2) & a_young(s1) & Theme(s1,x2) & of(x2,x1) & n_female(x1) & n_mother(x1))
exists p1 x1 x2 x3.(exists s1 x4.((x1 = x4) & n_playing(x4) & a_outside(s1) & Theme(s1,x4)) & n_son(x3) & n_mother(x2) & subset_of(x3,x1) & subset_of(x2,x1))