Several men dressed in white and red and building sand castles at the beach.
there are children at the beach
We don't know that the people are children.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5.(n_beach(x5) & at(e2,x5) & Actor(e2,x1) & v_castle(e2) & in(e1,x3) & n_sand(x3) & of(x3,x4) & n_building(x4) & a_red(s3) & Theme(s3,x3) & a_white(s2) & Theme(s2,x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1) & a_several(s1) & Theme(s1,x1))
exists p1 x1 x3.(n_beach(x3) & exists x2.((x1 = x2) & at(x2,x3) & n_child(x2)))