A young girl and boy dressed casually are dancing outside at a gathering.
The girl and boy are dancing.
A young girl and boy dressed casually, dancing outside, must at least be a girl and a boy, and also be dancing. These are necessary conditions.
exists e2 e1 s1 s2 s3 x1 x2 x3 x4 x5.(at(e2,x5) & n_gathering(x5) & a_outside(s3) & Manner(e2,s3) & Actor(e2,x1) & v_dance(e2) & a_casually(s2) & Manner(e1,s2) & Theme(e1,x4) & v_dress(e1) & (x1 = x4) & n_boy(x3) & n_girl(x2) & subset_of(x3,x1) & subset_of(x2,x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_boy(x3) & n_girl(x2) & subset_of(x3,x1) & subset_of(x2,x1) & Actor(e1,x1) & v_dance(e1))