A few people are at the beach.
Some people are spending time on a beach.
A few people can be written as some people, and on a beach is the same as at the beach.
exists p1 s1 x1 x2.(n_beach(x2) & at(x1,x2) & n_people(x1) & a_few(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(on(e1,x3) & n_beach(x3) & Theme(e1,x2) & Actor(e1,x1) & v_spend(e1) & n_time(x2) & n_people(x1))