Children climbing huge tree.
Kids are playing on a huge tree.
"children" and "kids" are synonyms. Climbing a tree is a form of playing.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_climb(e1) & n_tree(x3) & a_huge(s1) & Theme(s1,x3) & (x1 = x2) & n_child(x1))
exists e1 s1 x1 x2.(on(e1,x2) & n_tree(x2) & a_huge(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))