The dogs play in the snow on hind legs.
The dogs are sleeping on a hot day.
One can not be sleeping and play simultaneously
exists e1 x1 x2 x3 x4.(n_snow(x2) & n_dog(x1) & in(e1,x2) & on(x2,x3) & n_leg(x3) & of(x3,x4) & n_hind(x4) & Actor(e1,x1) & v_play(e1))
exists e1 s1 x1 x2.(n_dog(x1) & on(e1,x2) & n_day(x2) & a_hot(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sleep(e1))