a boy does a gymnastic trick under a tree.
A boy does a cartwheel under a tree.
A gymnastic trick is not necessarily a cartwheel.
exists e1 s1 x1 x2 x3.(under(e1,x3) & n_tree(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & a_gymnastic(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2 x3.(under(e1,x3) & n_tree(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_cartwheel(x2) & n_boy(x1))