A black bird with a yellow beak standing in green grass.
There is a bird in the grass.
To be in the grass means standing in the grass.
exists s1 s2 s3 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & in(x2,x4) & n_grass(x4) & a_green(s3) & Theme(s3,x4) & n_standing(x2) & of(x2,x3) & n_beak(x3) & a_yellow(s2) & Theme(s2,x2) & n_bird(x1) & a_black(s1) & Theme(s1,x1))
exists p1 x1 x3.(n_grass(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_bird(x2)))