A group of teenage boys watch as one of them cuts another boy's hair.
teenage getting hair cut
Not all boys are teenage. Cutting someone's hair doesn't necessarily constitute a hair cut, in the conventional sense.
exists e1 p1 s1 x1 x2 x3.(exists e2 x4 x5 x6.(Theme(e2,x6) & Actor(e2,x4) & v_cut(e2) & n_hair(x6) & of(x6,x5) & n_boy(x5) & -(x5 = x2) & of(x4,x1) & n_thing(x4) & card_eq_1(x4)) & n_boy(x2) & n_boy(x2) & n_thing(x1) & as(e1,p1) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & n_thing(x3) & of(x1,x2) & a_teenage(s1) & Theme(s1,x2) & n_group(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_get(e1) & n_cut(x2) & of(x2,x3) & n_hair(x3) & n_teenage(x1))