A lady pushes a stroller, behind a child, riding a tricycle, while another child walks along side.
The lady is the mother to all of these children.
A woman can do activities with children who are not her own, she is not necessarily the mother to any of them, much less all of them.
exists e1 e2 p1 x1 x2 x3 x4.(for(e1,e2) & exists e3 x5 x6.(along(e3,x6) & n_side(x6) & Actor(e3,x5) & v_walk(e3) & n_child(x5) & -(x5 = x3)) & n_child(x3) & n_child(x3) & while(e2,p1) & Theme(e2,x4) & Actor(e2,x1) & v_ride(e2) & n_tricycle(x4) & behind(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_push(e1) & n_stroller(x2) & n_lady(x1))
exists p1 x1 x2 x4.(n_child(x4) & n_mother(x2) & n_lady(x1) & all x3.(n_thing(x3) -> ((x1 = x2) & to(x2,x3) & of(x3,x4))))