they have been patiently waiting for 
(ROOT (S (NP (PRP they)) (VP (VBP have) (VP (VBN been) (ADVP (RB patiently)) (VP (VBG waiting) (PP (IN for)))))))
(ROOT (S (NP (PRP )) (VP (VBP ) (VP (VBN ) (ADVP (RB )) (VP (VBG ) (PP (IN )))))))