children are at play with a man in a blue shirt.
Kids play.
Children is a synonym for kids.
exists p1 x1.(exists s1 x2 x3 x4.(at(x1,x2) & in(x2,x4) & n_shirt(x4) & a_blue(s1) & Theme(s1,x4) & with(x2,x3) & n_man(x3) & n_play(x2)) & n_child(x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_kid(x1))