A football player in a blue jersey being tackled from behind by an opponent in a white jersey.
Nobody is tackling
A player is being tackled or ins´t tackling but not at the same time
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & in(x1,x3) & Actor(e1,x6) & in(x6,x7) & n_jersey(x7) & a_white(s2) & Theme(s2,x7) & n_opponent(x6) & from(e1,x5) & n_behind(x5) & Theme(e1,x4) & v_tackle(e1) & (x3 = x4) & n_jersey(x3) & a_blue(s1) & Theme(s1,x3) & n_player(x1) & of(x1,x2) & n_football(x2))
-exists e1 x1.(Actor(e1,x1) & v_tackle(e1) & n_person(x1))