Several dogs of different breeds play in a backyard.
There are dogs playing.
Several dogs that play means dogs are playing.
exists e1 s1 x1 x2 x3 x4.(n_breed(x3) & in(e1,x4) & n_backyard(x4) & Actor(e1,x1) & v_play(e1) & of(x1,x2) & -(x2 = x3) & n_breed(x2) & n_dog(x1) & a_several(s1) & Theme(s1,x1))
exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_dog(x2))