A group of kids are raising their hands.
The children are raising their hands.
"Children" is a synonym for "a group of kids."
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_raise(e1) & n_hand(x3) & of(x3,x1) & n_thing(x1) & of(x1,x2) & n_kid(x2) & n_group(x1))
exists e1 x1 x2.(n_hand(x2) & of(x2,x1) & n_thing(x1) & n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_raise(e1))