A young boy is sitting on the grass.
A child is at home
There can either be a young boy or a child. The word child can mean boy or girl.
exists e1 s1 x1 x2.(n_grass(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_home(x2)) & n_child(x1))