A boy and a dog run through the grass.
A boy and his dog run.
The boy and dog are running..
exists s1 x1 x2 x3 x4.(n_grass(x4) & a_topic(s1) & subset_of(x2,s1) & through(x2,x4) & n_run(x2) & of(x2,x3) & n_dog(x3) & subset_of(x1,s1) & n_boy(x1))
exists s1 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & n_run(x2) & of(x2,x3) & n_dog(x3) & of(x2,x1) & n_male(x1) & subset_of(x1,s1) & n_boy(x1))