A boy plays tennis.
A boy is playing his favorite sport.
Boy playing tennis does not mean its his favorite sport
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_tennis(x2) & n_boy(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_sport(x2) & a_favorite(s1) & Theme(s1,x2) & of(x2,x1) & n_male(x1) & n_boy(x1))