A young Asian boy approaches a Mallard duck on the sidewalk.
the boy is in class singing
A boy approaching a mallard duck doesn't have to be singing.
exists e1 s1 s2 x1 x2 x3 x4.(n_sidewalk(x4) & on(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_approach(e1) & n_duck(x2) & (x2 = x3) & ne_geo_mallard(x3) & n_boy(x1) & a_asian(s2) & Theme(s2,x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1.(n_boy(x1) & exists x2 x3.(in(x1,x2) & n_singing(x2) & of(x2,x3) & n_class(x3)))