A boy in black waves his arms while other people are behind him on a field.
a boy waves his arms outside
The boy waving his arm while others are behind him on a field is the same as saying the boy waves his arm outside.
(-x)
exists x1 x2 x3.(a_topic(x1) & outside(x1,x3) & n_arm(x3) & of(x3,x1) & n_male(x1) & n_wave(x1) & of(x1,x2) & n_boy(x2))