at every opportunity to do something clever 
(ROOT (PP (IN at) (NP (DT every) (NN opportunity) (S (VP (TO to) (VP (VB do) (NP (NP (NN something)) (ADJP (JJ clever)))))))))
(ROOT (PP (IN ) (NP (DT ) (NN ) (S (VP (TO ) (VP (VB ) (NP (NP (NN )) (ADJP (JJ )))))))))