People practicing yoga in the park.
The people are playing tennis.
They were practicing yoga not playing tennis.
exists e1 x1 x2 x3 x4.(n_park(x4) & a_topic(x1) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_practice(e1) & n_yoga(x3) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(n_people(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_tennis(x2))