the waiting flats , was shaking by scruffy trips .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_2 (ATNP_1 (DT_0 the) (VBG_0 waiting)) (NNS_0 flats)) (COMMA_0 ,)) (VP_4 (VBD_1 was) (VP_2 (VBG_0 shaking) (PP_2 (IN_0 by) (NP_3 (JJ_1 scruffy) (NNS_0 trips)))))) (DOT_0 .)))