The dressed up young people are sitting in chairs while they wait.
The young people were swimming in the pool.
If young people are sitting in chairs they are not swimming.
exists e1 e2 p1 s1 x1 x2.(n_thing(x1) & n_people(x1) & a_young(s1) & Theme(s1,x1) & r_up(x1) & Theme(e1,x1) & v_dress(e1) & exists e3.(Actor(e3,x1) & v_wait(e3)) & while(e2,p1) & in(e2,x2) & n_chair(x2) & Actor(e2,x1) & v_sit(e2))
exists e1 s1 x1 x2.(n_pool(x2) & n_people(x1) & a_young(s1) & Theme(s1,x1) & in(e1,x2) & Actor(e1,x1) & v_swim(e1))