on expressing itself in every way imaginable 
(ROOT (PP (IN on) (S (VP (VBG expressing) (NP (PRP itself)) (PP (IN in) (NP (NP (DT every) (NN way)) (ADJP (JJ imaginable))))))))
(ROOT (PP (IN ) (S (VP (VBG ) (NP (PRP )) (PP (IN ) (NP (NP (DT ) (NN )) (ADJP (JJ ))))))))