A boy playing with an sweeper.
A boy chasing his friend with a sweeper.
We cannot infer the boy is chasing anything or anyone. We also cannot infer that he is with a friend.
exists e1 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_sweeper(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & with(e1,x4) & n_sweeper(x4) & Theme(e1,x3) & Actor(e1,x2) & v_chase(e1) & n_friend(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_boy(x1))