becomes instead a grating endurance test 
(ROOT (S (VP (VBZ becomes) (ADVP (RB instead)) (NP (DT a) (VBG grating) (NN endurance) (NN test)))))
(ROOT (S (VP (VBZ ) (ADVP (RB )) (NP (DT ) (VBG ) (NN ) (NN )))))