Boy and girl running along the beach.
A boy and girl run along the side of the beach
The boy and girl are running along the beach, meaning they're on the side of it.
exists s1 x1 x2 x3 x4.(n_beach(x4) & ne_nam_boy(x1) & a_topic(s1) & subset_of(x2,s1) & along(x2,x4) & n_run(x2) & of(x2,x3) & n_girl(x3) & subset_of(x1,s1))
exists s1 x1 x2 x3 x4 x5.(n_beach(x5) & n_side(x4) & a_topic(s1) & along(s1,x4) & of(x4,x5) & subset_of(x2,s1) & n_run(x2) & of(x2,x3) & n_girl(x3) & subset_of(x1,s1) & n_boy(x1))