A large dog is running on the grass.
A large dog is running on the grass while chasing a tiger.
The dog is running and chasing a tiger or just running
exists e1 s1 x1 x2.(n_grass(x2) & on(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_large(s1) & Theme(s1,x1))
exists e1 e2 s1 x1 x2 x3.(n_grass(x2) & while(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_chase(e2) & n_tiger(x3) & on(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_large(s1) & Theme(s1,x1))