A gymnast stretches on the mat.
A man cutting down a tree.
You would not be cutting down a tree while on a mat.
exists e1 x1 x2.(n_mat(x2) & on(e1,x2) & Actor(e1,x1) & v_stretch(e1) & n_gymnast(x1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_cut(e1) & n_tree(x3) & (x1 = x2) & n_man(x1))