A dog sniffs the grass.
The dog is sitting at home waiting for his owner to come home from the racetrack.
A dog sniffs the grass can not be sitting at home waiting.
exists e1 x1 x2.(n_grass(x2) & Theme(e1,x2) & Actor(e1,x1) & v_sniff(e1) & n_dog(x1))
exists e2 e1 p1 x1 x2 x3 x5.(n_racetrack(x5) & n_owner(x3) & of(x3,x1) & n_male(x1) & n_dog(x1) & for(e1,e2) & for(e2,x3) & Topic(x3,p1) & exists e3 x4.(from(e3,x5) & Time(e3,x4) & n_home(x4) & Actor(e3,x3) & v_come(e3)) & Actor(e2,x1) & v_wait(e2) & at(e1,x2) & n_home(x2) & Actor(e1,x1) & v_sit(e1))