A group of children are playing on swings.
There are children playing.
' A group of children ' is a rephrasing of ' There are children '.
exists e1 x1 x2 x3.(on(e1,x3) & n_swing(x3) & Actor(e1,x1) & v_play(e1) & of(x1,x2) & n_child(x2) & n_group(x1))
exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_child(x2))