The light brown dog and dark brown dog are running in the green grass.
The grass is green so it is springtime.
The light brown dog and dark brown dog are running in the green grass does not imply it is springtime.
exists e1 s1 s2 s3 s4 s5 x1 x2 x3 x4.(n_grass(x4) & a_green(s5) & Theme(s5,x4) & n_dog(x3) & a_brown(s4) & Theme(s4,x3) & a_dark(s3) & Theme(s3,x3) & n_dog(x2) & subset_of(x3,x1) & subset_of(x2,x1) & a_brown(s2) & Theme(s2,x1) & a_light(s1) & Theme(s1,x1) & in(e1,x4) & Actor(e1,x1) & v_run(e1))
exists p1 s1 x1.(n_thing(x1) & n_grass(x1) & exists s2.(Theme(s2,x1) & a_springtime(s2)) & so(s1,p1) & Theme(s1,x1) & a_green(s1))