Two young kids are playing in the grass.
Two kids are playing in their room.
Grass grows outside.  So, the kids would not be able to play in the grass if they are playing in their room.
exists e1 s1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2.(in(e1,x2) & n_room(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_play(e1) & n_kid(x1) & card_eq_2(x1))