The boy is clutching the football and making a run for a touchdown while looking behind him.
The boy is playing the violin.
The boy could not be clutching a football while he is playing the violin.
exists e2 e1 e3 x1 x2 x3 x4.(n_male(x2) & n_boy(x1) & n_football(x2) & while(e2,e3) & behind(e3,x2) & Actor(e3,x1) & v_look(e3) & Theme(e2,x3) & Actor(e2,x1) & v_make(e2) & for(x3,x4) & n_touchdown(x4) & n_run(x3) & Theme(e1,x2) & Actor(e1,x1) & v_clutch(e1))
exists e1 x1 x2.(n_violin(x2) & n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))