A happy child enjoying the swings.
A happy kid is on a swing.
Kid and child have the same meaning.
exists e1 s1 x1 x2 x3.(n_swing(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_enjoy(e1) & (x1 = x2) & n_child(x1) & a_happy(s1) & Theme(s1,x1))
exists p1 s1 x1.(exists x2.(on(x1,x2) & n_swing(x2)) & n_kid(x1) & a_happy(s1) & Theme(s1,x1))