A boy in gray pajamas is jumping on the couch.
A boy is sitting on the couch.
One can not be sitting and jumping on the couch simultaneously.
exists e1 s1 x1 x2 x3.(n_couch(x3) & on(e1,x3) & Actor(e1,x1) & v_jump(e1) & in(x1,x2) & n_pajamas(x2) & a_gray(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2.(n_couch(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1))