A group of mountain climbers
A group of mountain climbers are on a beach
Mountain climbers should not be on a beach.  They should be on a mountain.
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & n_climber(x2) & of(x2,x3) & n_mountain(x3) & n_group(x1))
exists p1 x1 x2 x3.(exists x4.(on(x1,x4) & n_beach(x4)) & of(x1,x2) & n_climber(x2) & of(x2,x3) & n_mountain(x3) & n_group(x1))