A boy in a brown jacket holds a large chunk of snow.
the boy is having a snowball fight
A boy holding a chunk of snow isn't always involved in a snowball fight.
exists e1 s1 s2 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & of(x3,x4) & n_snow(x4) & n_chunk(x3) & a_large(s2) & Theme(s2,x3) & in(x1,x2) & n_jacket(x2) & a_brown(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2 x3.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_fight(x2) & of(x2,x3) & n_snowball(x3))