watch them clumsily mugging their way through snow dogs 
(ROOT (S (VP (VB watch) (S (NP (PRP them)) (ADVP (RB clumsily)) (VP (VBG mugging) (NP (PRP$ their) (NN way)) (PP (IN through) (NP (NN snow) (NNS dogs))))))))
(ROOT (S (VP (VB ) (S (NP (PRP )) (ADVP (RB )) (VP (VBG ) (NP (PRP$ ) (NN )) (PP (IN ) (NP (NN ) (NNS ))))))))