A white dog fetching a yellow toy.
The dog slept on the couch.
The dog cannot be fetching a toy whilst also sleeping
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_fetch(e1) & n_toy(x3) & a_yellow(s2) & Theme(s2,x3) & (x1 = x2) & n_dog(x1) & a_white(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_couch(x2) & n_dog(x1) & on(e1,x2) & Actor(e1,x1) & v_sleep(e1))