Some ladies on an outing.
There are only ladies in the group.
Only ladies explains some ladies.
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_outing(x2) & n_lady(x1))
exists p1 s1 x1 x3.(n_group(x3) & a_only(s1) & Manner(p1,s1) & exists x2.((x1 = x2) & in(x2,x3) & n_lady(x2)))