Children walking in the rain.
The children are moving their feet.
Children are walking, therefore feet are moving.
exists x1 x2 x3.(n_rain(x3) & a_topic(x1) & in(x1,x3) & n_walking(x1) & (x1 = x2) & ne_nam_children(x2))
exists e1 x1 x2.(n_foot(x2) & of(x2,x1) & n_thing(x1) & n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_move(e1))